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Introduces the multi-berth interest model from plan §3.1: a junction between interests and berths with three role flags so the same berth can be linked as the primary deal target, an EOI-bundle inclusion, or a "just exploring" link without conflating semantics. - 0028 schema migration creates interest_berths with the unique partial index "≤1 primary per interest", a unique compound on (interest_id, berth_id), and indexes for the public-map "under offer" lookup (where is_specific_interest=true). - Same migration adds desired_length_ft / desired_width_ft / desired_draft_ft to interests for the recommender. - Same migration runs the Phase 2 data migration: every interest with a non-null berth_id gets one junction row marked is_primary=true, is_specific_interest=true, and is_in_eoi_bundle = (eoi_status='signed'). Pre-flight check halts on dangling FKs (§14.3 critical case). - New service src/lib/services/interest-berths.service.ts owns reads + writes of the junction. getPrimaryBerth / getPrimaryBerthsForInterests feed list pages; upsertInterestBerth demotes the prior primary in the same transaction so the unique index is never violated. - interests.berth_id stays in place this commit so existing callers keep working; Phase 2b migrates them onto the helper service and a later migration drops the column. 53 dev rows seeded into the junction; tests still green at 996. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>