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

frontend/src/services/entity-onboarding.service.ts

@@ -0,0 +1,36 @@
+import { api } from "@/lib/api-client";
+import type {
+  BulkCreateResult,
+  CSVValidationReport,
+  CredentialFilters,
+  CredentialStatus,
+} from "@/types";
+import type { ApiSuccessResponse } from "@/types";
+
+export const entityOnboardingService = {
+  validateCsv: (file: File) => {
+    const fd = new FormData();
+    fd.append("file", file);
+    return api.upload<CSVValidationReport>("/entity/students/csv/validate", fd);
+  },
+
+  bulkCreate: (payload: { validate_session_id?: string }) =>
+    api.post<BulkCreateResult>("/entity/students/bulk-create", payload),
+
+  sendCredentials: (studentIds: number[]) =>
+    api.post<ApiSuccessResponse>("/entity/students/send-credentials", { student_ids: studentIds }),
+
+  getCredentialStatuses: (
+    filters?: CredentialFilters & { page?: number; limit?: number },
+  ) =>
+    api.get<{ data: CredentialStatus[]; pagination?: { total: number; page: number } }>(
+      "/entity/students/credentials",
+      filters as Record<string, string | number | boolean | undefined>,
+    ),
+
+  resendCredential: (studentId: number) =>
+    api.post<ApiSuccessResponse>(`/entity/students/${studentId}/resend-credential`),
+
+  resendAllPending: () =>
+    api.post<ApiSuccessResponse>("/entity/students/resend-credentials/pending"),
+};