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replace uReadability with markdown.new for content extraction

uReadability often fails to extract content from websites that block
server-side requests. markdown.new (Cloudflare-powered) provides a
three-tier fallback pipeline (content negotiation → Workers AI →
browser rendering) that handles JS-heavy and bot-protected sites.

- add MarkdownNewClient implementing uKeeperGetter interface
- parse markdown.new response format (Title header + YAML frontmatter)
- replace UKeeperClient wiring in main.go
- remove --ur-api/--ur-token flags, add --mdnew-api flag
- add unit tests for client and response parser

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>