feat(#7,#10): signal crawler -- Reddit + Lemmy community monitoring
Implements the full signal detection pipeline:
Backend:
- app/services/lemmy/client.py: async Lemmy API v3 client, community@instance
addressing, integer cursor dedup, normalised post dicts
- app/services/scraper.py: platform-agnostic scraper; Reddit (.json API,
fullname cursor) + Lemmy (integer ID cursor); keyword/regex/all match modes,
min_score gate, NormalizedPost shape, upsert dedup via UNIQUE post_id
- app/api/endpoints/signals.py: CRUD for signal_rules + signals queue;
POST /signals/scrape manual trigger; scrape-state viewer
- migrations 010-012: signal_rules, signals, signal_scrape_state tables
- scheduler: interval job every 30 min (scraper_enabled=True in config)
- Fixed migration collision: 007_signal_rules.sql → 010, 008 → 011, 009 → 012
Frontend:
- SignalsView.vue: signal feed with status filter (new/saved/dismissed),
keyword chips, score/comment counts, save/dismiss actions, rules editor panel
- api.ts: SignalRule, Signal types + signalRules/signals API methods
- Nav: Signals as default landing route (replaces /campaigns default)
Closes #7 (signal extraction), closes #10 (Lemmy JSON crawler)
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