Activity feed backend cleanup

[pikonha]

Summary

Adds a full-stack activity feed backend for governance events, covering indexing, storage, and API querying with relevance-based filtering.

Indexer (apps/indexer)

• New feed_event table with txHash, logIndex, type (VOTE, PROPOSAL, DELEGATION, TRANSFER), value, and timestamp, indexed for efficient querying
• Event handlers updated to emit feed_event records on every vote cast, proposal created, delegation change, and token transfer across all governor indexers (ENS, UNI, OP, SCR, COMP, OBOL, ZK, Nouns, GTC)
• logIndex now passed through from all governor event handlers to support composite primary keys

API (apps/api)

• GET /feed/events endpoint with pagination (skip, limit), ordering (timestamp/value, asc/desc), date range filtering (fromDate/toDate), event type filtering, and relevance filtering
• Relevance system: per-DAO token thresholds (LOW/MEDIUM/HIGH) for transfers, delegations, and votes — proposals are always included as high relevance
• Service layer computes relevance per item and maps DB rows to API responses
• Repository layer builds dynamic SQL filters combining type + value threshold conditions using Drizzle ORM

Test plan

• Verify indexer inserts feed_event rows for votes, proposals, delegations, and transfers
• Query GET /feed/events with different relevance levels (LOW, MEDIUM, HIGH) and confirm correct filtering
• Test pagination, ordering, type filtering, and date range params
• Confirm proposals always appear regardless of relevance level

Deployed for Obol on dev.

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