Update admin.md to reflect Phase 3 Part 3 implementation changes:
**Rate Limiting Section:**
- Split into two subsections: API Key Rate Limiting and IP-Based Rate Limiting
- API Key Rate Limiting: Expanded affected endpoints list to include scope management
- IP-Based Rate Limiting: New section documenting 10/hour limit for live URLs
- Separate from API key limits
- Only cache MISS counts toward limit
- Supports X-Forwarded-For header
- In-memory store with automatic cleanup
**Error Codes Section:**
- Reorganized into categorized tables for better clarity
- Added HTTP 409 (Conflict) status code
- Added Authentication Error Codes table
- Added Rate Limiting Error Codes table with both API key and IP limits
- Added Live Scope Error Codes table:
- SCOPE_INVALID_FORMAT (400)
- SCOPE_ALREADY_EXISTS (409)
- SCOPE_NOT_FOUND (404)
- IMAGE_NOT_IN_SCOPE (400)
**Documentation Improvements:**
- All error responses include standard format
- Rate limit errors include Retry-After header
- Scope endpoints require project key authentication
- Comprehensive notes for each section
All documentation now accurately reflects current API v1 implementation.
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Co-Authored-By: Claude <noreply@anthropic.com>
Oleg Proskurin