docs(12-01): document backend API contract for attachments

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- Complete API reference for all three endpoints (POST/GET/DELETE)
- Request/response formats with JSON examples
- File validation rules (extensions, size limits)
- ChatMessage integration and WebSocket broadcast
- S3 storage details and signed URL expiration
- Authentication/authorization patterns
- Error handling with HTTP status codes
- Complete React implementation examples
- curl examples for all endpoints
- 1119 lines with comprehensive coverage

ATTACHMENT_API.md: .planning/phases/12-attachment-research-&-backend-validation/docs/ATTACHMENT_API.md

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