Implement W3C Micropub media endpoint for external client uploads.
Changes:
- Add POST /micropub/media endpoint in routes/micropub.py
- Accept multipart/form-data with 'file' field
- Require bearer token with 'create' scope
- Return 201 Created with Location header
- Validate, optimize, and generate variants via save_media()
- Update q=config response to advertise media-endpoint
- Include media-endpoint URL in config response
- Add 'photo' post-type to supported types
- Add photo property support to Micropub create
- extract_photos() function to parse photo property
- Handles both simple URL strings and structured objects with alt text
- _attach_photos_to_note() function to attach photos by URL
- Only attach photos from our server (by URL match)
- External URLs logged but ignored (no download)
- Maximum 4 photos per note (per ADR-057)
- SITE_URL normalization pattern
- Use .rstrip('/') for consistent URL comparison
- Applied in media endpoint and photo attachment
Per design document: docs/design/v1.4.0/media-implementation-design.md
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Co-Authored-By: Claude <noreply@anthropic.com>
Phil Skentelbery
c64feaea23