feat(v3): restructure project + add complete frontend

- Restructure: move backend from new_project/ to backend/
- Add full React/TypeScript frontend (37 pages, 17 services, 16 type defs, 11 query hooks)
- Add docs/ with SRS specs, user stories, and workflow documentation
- Update .gitignore for new directory layout

Workflows implemented:
  WF1 User Signup, WF2 Placement Test, WF3 Exam Configuration,
  WF4 General English Exam, WF5 Course Generation,
  WF6 Entity Student Onboarding, AI Course Generation,
  Adaptive Learning Engine UI, White-Label Branding, Score Release

Made-with: Cursor

custom_addons/encoach_placement/models/student_ability.py

@@ -0,0 +1,26 @@
+from odoo import models, fields
+
+
+class EncoachStudentAbilityModel(models.Model):
+    _name = 'encoach.student.ability.model'
+    _description = 'Student Ability Estimate per Skill'
+
+    student_id = fields.Many2one('res.users', required=True, ondelete='cascade', index=True)
+    subject_id = fields.Many2one('encoach.subject', ondelete='set null')
+    skill = fields.Selection([
+        ('listening', 'Listening'),
+        ('reading', 'Reading'),
+        ('writing', 'Writing'),
+        ('speaking', 'Speaking'),
+        ('grammar', 'Grammar'),
+        ('vocabulary', 'Vocabulary'),
+    ])
+    theta = fields.Float(default=0.0)
+    sem = fields.Float(default=1.0)
+    last_updated = fields.Datetime(default=fields.Datetime.now)
+
+    _sql_constraints = [
+        ('unique_student_subject_skill',
+         'unique(student_id, subject_id, skill)',
+         'Duplicate ability record'),
+    ]