feat(analysis): worker daemon + real dispatcher + app wiring
The background analysis worker that drains analyze_page jobs:
- analysis::daemon: a lean sibling of the crawler daemon — leases only
KIND_ANALYZE_PAGE, skip-if-done-unless-force, lease heartbeat, panic +
timeout isolation, ack done/failed, and a failed page_analysis row on
terminal (dead-lettered) failure. AnalyzeDispatcher trait seam.
- RealAnalyzeDispatcher: load page → storage.get → VisionClient.analyze →
persist_analysis (skips a deleted page; caps image bytes).
- app::build spawns the daemon (own plain reqwest client) when
ANALYSIS_ENABLED; AppHandle/main shut it down alongside the crawler.
- repo::page::find_by_id.
Tests: dispatch+ack-done, skip-when-done, force re-dispatch, terminal
failure writes failed row, panic isolation, ignores non-analyze jobs.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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