Implement comprehensive live scope management API and IP-based rate limiting
for live URL generation endpoints (Sections 8.5 and 8.6).
**Scope Management CRUD Endpoints:**
- POST /api/v1/live/scopes - Create scope manually with slug validation
- GET /api/v1/live/scopes - List scopes with pagination and stats
- GET /api/v1/live/scopes/:slug - Get single scope by slug with stats
- PUT /api/v1/live/scopes/:slug - Update scope settings
- POST /api/v1/live/scopes/:slug/regenerate - Regenerate scope images
- DELETE /api/v1/live/scopes/:slug - Delete scope with cascading image deletion
**Scope Management Features:**
- Slug format validation (alphanumeric, hyphens, underscores)
- Duplicate slug prevention with 409 Conflict response
- Scope statistics (currentGenerations, lastGeneratedAt)
- Settings management (allowNewGenerations, newGenerationsLimit)
- Regeneration support (single image or all images in scope)
- Hard delete with image cleanup following alias protection rules
- All endpoints require Project Key authentication
**IP-Based Rate Limiting:**
- In-memory rate limit store with automatic cleanup
- Limits: 10 new generations per hour per IP address
- Only cache MISS (new generation) counts toward limit
- Cache HIT does NOT count toward limit
- X-Forwarded-For header support for proxy/load balancer setups
- Rate limit headers: X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset
- Retry-After header on 429 Too Many Requests response
- Automatic cleanup of expired entries every 5 minutes
**IP Rate Limiter Middleware:**
- ipRateLimiterMiddleware attaches to live URL endpoint
- getClientIp() extracts IP from X-Forwarded-For or req.ip
- checkIpRateLimit() validates and increments counter
- getRemainingRequests() returns available request count
- getResetTime() returns seconds until reset
- Middleware attaches checkIpRateLimit function to request
- Rate limit check executed AFTER cache check (only for cache MISS)
**Type System Updates:**
- Added LiveScopeResponse interface with all scope fields
- Added LiveScopeWithImagesResponse with images array
- Added response type aliases for all CRUD operations
- Added toLiveScopeResponse() converter function
- Added CreateLiveScopeRequest, UpdateLiveScopeRequest interfaces
- Added ListLiveScopesQuery with pagination parameters
- Added RegenerateScopeRequest with optional imageId
**Route Integration:**
- Mounted scopes router at /api/v1/live/scopes
- Applied ipRateLimiterMiddleware to live URL endpoint
- Rate limit increments only on cache MISS (new generation)
- Cache HIT bypasses rate limit check entirely
**Technical Notes:**
- All scope endpoints return toLiveScopeResponse() format
- Pagination using buildPaginationMeta helper
- Bracket notation for meta field access (TypeScript strict mode)
- Proper number parsing with fallback defaults
- All Phase 3 Part 3 code is fully type-safe with zero TypeScript errors
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Oleg Proskurin