Fix API Endpoint Mismatches Between Frontend and Backend

[ElioNeto]

Fix API Endpoint Mismatches

The Angular frontend was built against an older or different API contract. Several endpoints called by the frontend do not match what the backend actually exposes.

Mismatches to Fix

🔴 Critical — Frontend calls that fail

Frontend Call	What It Does	Backend Reality	Fix
POST /keys with body {key, value}	Insert/update	Backend has PUT /keys/{key} with body {value}	Fix frontend: change to PUT /keys/{key} or fix backend: register POST /keys handler
GET /keys/search?q=&prefix=	Search keys	No such endpoint	Fix backend: register GET /keys/search or fix frontend: use GET /keys?prefix=
POST /keys/batch	Batch insert	No such endpoint	Fix backend: register batch endpoint
GET /scan	Scan all keys	No such REST endpoint	Fix backend: register GET /scan or use GraphQL

🟡 Medium — Endpoints that partially work

Frontend Call	Backend Reality	Fix
GET /stats/all	Backend has GET /stats	Align frontend to use /stats
GET /health	Backend has /health/liveness, /health/readiness, /health/startup	Align frontend to use correct health endpoints

Missing Backend Endpoints (Frontend expects them)

The following pages are fully built in the frontend but have NO backend routes:

Frontend Page	Endpoints Needed	Status
Features (/features)	GET /features, POST /features/{name}	Backend src/features/ exists but has no API handlers
Admin Tokens (/admin)	GET /admin/tokens, POST /admin/tokens, DELETE /admin/tokens/{id}	TokenManager exists but no REST routes

Files to Modify

Frontend:

• frontend/src/app/services/apex-store.service.ts — Update endpoint URLs

Backend:

• src/api/mod.rs — Register new endpoints
• src/api/admin/mod.rs — Token CRUD routes
• src/features/mod.rs — Feature flag API handlers (or new src/api/features.rs)

Acceptance Criteria

• Frontend Dashboard PUT/GET operations work end-to-end
• Frontend Key Explorer search works end-to-end
• Frontend Key Explorer batch insert works
• Frontend Features page loads and toggles flags
• Frontend Admin tokens page creates, lists, and revokes tokens
• No 404/405 errors in browser DevTools network tab
• All existing frontend tests pass

Parent Epic

#290

[ElioNeto]

Resolved via feat/notes-engine-v2 branch (PR #321) - commit closes via merge to main