feat(course-plan): RAG sources + multi-modal media + assignments + student view

Builds the §24 product on top of the LangGraph runtime from §22:

Phase A (Sources / RAG)
  - encoach.course.plan.source model (file | url | text)
  - SourceIndexer extracts PDF (pypdf), DOCX (python-docx), HTML, plain
    text and embeds chunks via the existing pgvector pipeline scoped to
    plan_id, so resources.search only returns the plan's own corpus
  - Endpoints: list/create/upload/reindex/delete + plan-scoped retrieval

Phase B (Deliverables)
  - services.deliverables.compute_deliverables walks the plan, derives
    {planned, generated, ready} per week from material + media state
  - GET /api/ai/course-plan/<id>/deliverables drives the new wizard
    preview step and the live progress strip on the detail page

Phase C (Multi-modal media)
  - encoach.course.plan.media model + MediaService:
    audio: AWS Polly (default) or ElevenLabs
    image: OpenAI DALL-E 3, capped per plan via system parameter
    video: local ffmpeg subprocess (image + audio -> MP4 1280x720)
  - Three new agent tools (media.synthesize_audio / generate_image /
    compose_video), wired into course_week_materials and a new
    course_media_director agent
  - Endpoints per material + week-level batch generator

Phase D (Assignments)
  - encoach.course.plan.assignment supports mode='batch' (op.batch) or
    mode='students' (res.users), with due_date + message + state
  - REST endpoints to list / create / delete assignments

Phase E (Student view)
  - /api/student/course-plans + /api/student/course-plans/<id>
    enforce visibility via assignment.expand_user_ids()
  - New /student/course-plans list + read-only drilldown rendering
    audio/image/video tiles from /web/content/<attachment_id>

Cross-cutting
  - encoach.ai.tool.category: + media (so the new tools register)
  - encoach.embedding gains a plan_id filter for plan-scoped RAG
  - Wizard adds Sources + Multimedia steps; AdminCoursePlanDetail
    rewritten with DeliverablesStrip + SourcesCard + AssignmentsCard +
    per-material MediaDrawer
  - ~280 new EN + AR i18n keys (full RTL coverage)
  - smoke_course_plan.py exercises every phase via odoo-bin shell;
    last run: PASS A/B/D/E + DALL-E 3 image (753 KB), Polly audio
    fails cleanly when AWS creds aren't configured (expected)

Documentation: §24 added to docs/PROJECT_SUMMARY.md with phase-by-phase
artefact list, endpoints, smoke test, ops notes, and gotchas.

Made-with: Cursor

src/i18n/locales/en.ts

@@ -105,6 +105,7 @@ const en: Translations = {
     dashboard: "Dashboard",
     courses: "Courses",
     myCourses: "My Courses",
+    myCoursePlans: "My Course Plans",
     students: "Students",
     teachers: "Teachers",
     batches: "Batches",
@@ -796,8 +797,14 @@ const en: Translations = {
         basicsDesc: "Name the course and set level, duration, and weekly hours.",
         coverage: "Coverage",
         coverageDesc: "Tell the AI how hours split across skills and who the learners are.",
+        sources: "Reference sources",
+        sourcesDesc:
+          "Drop PDFs, URLs, or pasted text. The AI uses them as grounding when generating each week's materials.",
         scope: "Scope",
         scopeDesc: "Optional: grammar focus, resources to reference, free-form notes.",
+        media: "Multimedia",
+        mediaDesc:
+          "Pick which media the AI should auto-produce alongside the text materials.",
         review: "Review",
         reviewDesc: "Double-check your brief before kicking off the generation.",
       },
@@ -825,7 +832,156 @@ const en: Translations = {
         cefrRequired: "Please pick a CEFR level.",
         weeksRange: "Total weeks must be at least 1.",
       },
+      review: {
+        sourcesCount_one: "{{count}} reference source",
+        sourcesCount_other: "{{count}} reference sources",
+        noSources: "No reference sources",
+        mediaNone: "No media generation",
+      },
     },
+    sections_extras: {
+      sources: "Reference sources",
+      progress: "Generation progress",
+      assignments: "Assignments",
+      media: "Generated media",
+    },
+    sources: {
+      sectionTitle: "Reference sources (RAG)",
+      sectionDesc:
+        "Upload PDFs, paste URLs, or drop in raw text. The AI will use the indexed content as grounding when it writes weekly materials.",
+      collected_one: "{{count}} source ready",
+      collected_other: "{{count}} sources ready",
+      empty: "No reference sources yet.",
+      dropTitle: "Add reference materials",
+      dropHint: "PDF, DOCX, TXT, HTML, or plain text — up to a few MB each.",
+      uploadFiles: "Upload files",
+      urlLabel: "Add a URL",
+      textLabel: "Or paste text directly",
+      textPlaceholder: "Paste a passage to ground the AI on…",
+      uploadFailed: "Couldn't upload \"{{name}}\".",
+      reindex: "Reindex",
+      reindexed: "Source reindexed.",
+      reindexFailed: "Reindex failed.",
+      deleted: "Source deleted.",
+      deleteFailed: "Couldn't delete source.",
+      status: {
+        pending: "Pending",
+        indexing: "Indexing…",
+        indexed: "Indexed",
+        failed: "Failed",
+      },
+      kindLabel: {
+        file: "File",
+        url: "URL",
+        text: "Text",
+      },
+      chunks_one: "{{count}} chunk",
+      chunks_other: "{{count}} chunks",
+    },
+    sourceKind: {
+      file: "File",
+      url: "URL",
+      text: "Inline text",
+    },
+    deliverables: {
+      title: "Generation progress",
+      subtitle:
+        "What the AI is going to produce, what it has produced, and what is fully ready (materials + media).",
+      summary: {
+        planned_one: "{{count}} planned",
+        planned_other: "{{count}} planned",
+        generated_one: "{{count}} generated",
+        generated_other: "{{count}} generated",
+        ready_one: "{{count}} ready",
+        ready_other: "{{count}} ready",
+      },
+      mediaCounts: "Audio {{audio}} · Image {{image}} · Video {{video}}",
+      status: {
+        planned: "Planned",
+        generated: "Generated",
+        ready: "Ready",
+      },
+      perWeek: "Per-week breakdown",
+      noWeeks: "No weeks yet — generate the plan first.",
+    },
+    media: {
+      audio: "Audio",
+      image: "Image",
+      video: "Video",
+      audioTitle: "Narration audio",
+      audioDesc:
+        "Generate spoken audio (Polly / ElevenLabs) for listening scripts and speaking prompts.",
+      imageTitle: "Cover images",
+      imageDesc:
+        "Generate DALL·E 3 images for reading texts and listening scripts. Counts against the per-plan image budget.",
+      videoTitle: "Slideshow video",
+      videoDesc:
+        "Combine audio + image into a short MP4 with ffmpeg. Slowest option.",
+      hint:
+        "Audio is on by default. Video is off by default — turn it on once you've reviewed the audio + image.",
+      drawerTitle: "Media for \"{{title}}\"",
+      drawerSubtitle: "Generate or remove audio, images, and slideshow video.",
+      generateAudio: "Generate audio",
+      generateImage: "Generate image",
+      generateVideo: "Generate video",
+      generating: "Generating…",
+      audioReady: "Audio ready",
+      imageReady: "Image ready",
+      videoReady: "Video ready",
+      audioFailed: "Audio generation failed.",
+      imageFailed: "Image generation failed.",
+      videoFailed: "Video generation failed.",
+      deleted: "Media deleted.",
+      deleteFailed: "Couldn't delete media.",
+      open: "Open",
+      download: "Download",
+      noMedia: "No media yet for this material.",
+      mediaForMaterial: "Media",
+      bulk: "Generate week media",
+      bulkSuccess: "Week media generation done.",
+      bulkFailed: "Couldn't generate week media.",
+      provider: "Provider",
+    },
+    assignments: {
+      title: "Assigned to",
+      empty: "Not assigned to anyone yet.",
+      assign: "Assign",
+      assignTitle: "Assign this course plan",
+      assignSubtitle:
+        "Pick a class (batch) for everyone, or individual students. They'll see the plan in their student dashboard.",
+      modeBatch: "Whole class (batch)",
+      modeStudents: "Individual students",
+      pickBatch: "Select a batch",
+      pickStudents: "Pick students",
+      noBatches: "No batches available.",
+      noStudents: "No students available.",
+      dueDate: "Due date (optional)",
+      message: "Message to learners (optional)",
+      messagePlaceholder: "Welcome note, expectations, deadlines…",
+      created: "Plan assigned.",
+      createFailed: "Couldn't assign plan.",
+      removed: "Assignment removed.",
+      removeFailed: "Couldn't remove assignment.",
+      remove: "Remove",
+      confirmRemove: "Remove this assignment?",
+      assignedBy: "Assigned by {{name}}",
+      students_one: "{{count}} student",
+      students_other: "{{count}} students",
+      cancel: "Cancel",
+      save: "Assign",
+    },
+    student: {
+      listTitle: "My course plans",
+      listSubtitle:
+        "Personalised AI-generated curricula assigned by your teacher. Open one to see the weekly plan, materials, and media.",
+      empty: "No plans assigned to you yet.",
+      open: "Open course",
+      assignedBy: "Assigned by {{name}}",
+      due: "Due {{date}}",
+      noDue: "No deadline",
+      backToList: "Back to my plans",
+    },
+    wizardSourcesStep: "Sources",
   },
   aiAdmin: {
     title: "AI Agents & Tools",