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

src/services/taxonomy.service.ts

@@ -0,0 +1,73 @@
+import { api } from "@/lib/api-client";
+import type { Subject, Domain, Topic, LearningObjective, TaxonomyTree, PaginatedResponse, PaginationParams, ApiSuccessResponse } from "@/types";
+
+export const taxonomyService = {
+  async listSubjects(): Promise<Subject[]> {
+    const res = await api.get<{ data: Subject[] } | Subject[]>("/subjects");
+    return Array.isArray(res) ? res : (res as { data: Subject[] }).data ?? [];
+  },
+
+  async getSubject(id: number): Promise<Subject> {
+    const res = await api.get<{ data: Subject } | Subject>(`/subjects/${id}`);
+    return (res as { data: Subject }).data ?? res;
+  },
+
+  async createSubject(data: Partial<Subject>): Promise<Subject> {
+    return api.post<Subject>("/subjects", data);
+  },
+
+  async updateSubject(id: number, data: Partial<Subject>): Promise<Subject> {
+    return api.patch<Subject>(`/subjects/${id}`, data);
+  },
+
+  async deleteSubject(id: number): Promise<ApiSuccessResponse> {
+    return api.delete<ApiSuccessResponse>(`/subjects/${id}`);
+  },
+
+  async getTaxonomyTree(subjectId: number): Promise<TaxonomyTree> {
+    const res = await api.get<{ data: TaxonomyTree } | TaxonomyTree>(`/subjects/${subjectId}/taxonomy`);
+    return (res as { data: TaxonomyTree }).data ?? res;
+  },
+
+  async importTaxonomy(subjectId: number, data: FormData): Promise<ApiSuccessResponse> {
+    return api.upload<ApiSuccessResponse>(`/subjects/${subjectId}/taxonomy/import`, data);
+  },
+
+  async listDomains(params?: { subject_id?: number }): Promise<Domain[]> {
+    const res = await api.get<{ data: Domain[] } | Domain[]>("/domains", params as Record<string, string | number | boolean | undefined>);
+    return Array.isArray(res) ? res : (res as { data: Domain[] }).data ?? [];
+  },
+
+  async createDomain(data: Partial<Domain>): Promise<Domain> {
+    return api.post<Domain>("/domains", data);
+  },
+
+  async updateDomain(id: number, data: Partial<Domain>): Promise<Domain> {
+    return api.patch<Domain>(`/domains/${id}`, data);
+  },
+
+  async deleteDomain(id: number): Promise<ApiSuccessResponse> {
+    return api.delete<ApiSuccessResponse>(`/domains/${id}`);
+  },
+
+  async aiSuggestTopics(domainId: number): Promise<{ suggestions: Partial<Topic>[] }> {
+    return api.post(`/domains/${domainId}/ai-suggest`);
+  },
+
+  async listTopics(params?: { domain_id?: number; subject_id?: number }): Promise<Topic[]> {
+    const res = await api.get<{ data: Topic[] } | Topic[]>("/topics", params as Record<string, string | number | boolean | undefined>);
+    return Array.isArray(res) ? res : (res as { data: Topic[] }).data ?? [];
+  },
+
+  async createTopic(data: Partial<Topic>): Promise<Topic> {
+    return api.post<Topic>("/topics", data);
+  },
+
+  async updateTopic(id: number, data: Partial<Topic>): Promise<Topic> {
+    return api.patch<Topic>(`/topics/${id}`, data);
+  },
+
+  async deleteTopic(id: number): Promise<ApiSuccessResponse> {
+    return api.delete<ApiSuccessResponse>(`/topics/${id}`);
+  },
+};