feat: auth service + security audit fixes + cleanup legacy services

Major changes:
- Add auth-svc: JWT auth, register/login/refresh, password reset
- Add auth UI: modals, pages (/login, /register, /forgot-password)
- Add usage tracking (usage_metrics table, daily limits)
- Add tiered rate limiting (free/pro/business)
- Add LLM usage limits per tier

Security fixes:
- All repos now require userID for Update/Delete operations
- JWT middleware in chat-svc, llm-svc, agent-svc, discover-svc
- ErrNotFound/ErrForbidden errors for proper access control

Cleanup:
- Remove legacy TypeScript services/ directory
- Remove computer-svc (to be reimplemented)
- Remove old deploy/docker configs

New files:
- backend/cmd/auth-svc/main.go
- backend/internal/auth/{types,repository}.go
- backend/internal/usage/{types,repository}.go
- backend/pkg/middleware/{llm_limits,ratelimit_tiered}.go
- backend/webui/src/components/auth/*
- backend/webui/src/app/(auth)/*

Made-with: Cursor

backend/Makefile

@@ -3,7 +3,7 @@
 GO=go
 GOFLAGS=-ldflags="-s -w"
 
-SERVICES=api-gateway chat-svc agent-svc search-svc llm-svc scraper-svc discover-svc collection-svc file-svc thread-svc computer-svc
+SERVICES=api-gateway auth-svc chat-svc agent-svc search-svc llm-svc scraper-svc discover-svc collection-svc file-svc thread-svc admin-svc
 
 all: build