feat(app): nationwide breakwater list — search + region browse (v0.7.0)

Wires the 249-breakwater dataset into the app:
- TopSearch: instant local match over breakwaters (🛟, name/address) shown
  above official stations (⚓) and Kakao places (📍) — e.g. "지세포" →
  지세포방파제 first, no network round-trip.
- My Spots: "방파제 전체보기" — region-grouped collapsible list (강원..제주),
  mirroring the reference app's 전체지역보기; tap a breakwater to load tide/
  multtae/current at its coordinate.
- types/api gain Breakwater + api.breakwaters().

Verified on mobile viewport: "지세포" shows the curated 🛟 breakwater first
then Kakao results; region accordion lists all 249 by area.

Constraint: breakwater coords drive the model tide path; spots near the 61 official stations still auto-snap to exact official data (≤6km).
Confidence: high
Scope-risk: module
Reversibility: trivial
Tested: app build clean; APK deployed (v0.7.0); Playwright confirms instant breakwater search + region browse.
Not-tested: on-device; full scroll/expand of every region group.
Related: docs/BACKLOG.md 0

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