Water sources layer (OSM) - phase 0+1

[indiana]

Adds the water sources map layer (OSM) per docs/water-sources-PLAN.md.

• Phase 0: PT WODOW relabel to a dedicated 'Wodowanie sprzetu wodnego' group.
• Phase 1: WaterSource model + SQLDelight (5.sqm), bundled baseline, manifest-based sync (bundled asset + daily-throttled refresh from https://indiana.github.io/zwl-data/), map layer on Android+iOS, details card with ODbL attribution + disclaimer.
• Toggles: parent 'Woda' with drinking water / springs / wells children, persisted per group.
• No Overpass/GitHub-Releases/commercial APIs at runtime.

Android verified locally (assembleDebug + testDebugUnitTest green). iOS needs CI.