feat: add Estonia CCTV packs (Tallinn + Tarktee)

[350d]

Summary

• Add Tallinn intersection CCTV pack (config/cctv_sources.tallinn.json, 255 curated cameras) with public stills from ristmikud.tallinn.ee.
• Add Estonia Transpordiamet / Tarktee road-weather CCTV pack via keyless DATEX2 (roadCameraLocations + roadCameraImages), 179 cameras with rotating JPEG URLs.
• Wire both into the default live CCTV merge in vite.config.js, raise the global catalog cap, add Tallinn city POIs, attribution, changelog, and pack tests.

Test plan

• npm test (includes src/data/cctvEstonia.test.mjs)
• npm run build
• npm run test:track with dev server up
• Enable CCTV, fly to Tallinn — icons + stills from ristmikud.tallinn.ee
• Pan across Estonia highways — Tarktee weather cams load; frames refresh after source-cache TTL
• Confirm Data attribution lists City of Tallinn and Transpordiamet / Tarktee
• CCTV_TALLINN_ENABLED=0 / CCTV_TARKTEE_ENABLED=0 disable each pack independently

Notes

• YouTube / third-party HLS cams intentionally omitted (stills-first, public city/agency sources only).
• Tarktee MapServer image_path is stale; DATEX supplies current frame URLs.

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