feat(types): adopt TypeScript types generated from the API

[escapedcat]

Frontend half of teambtcmap/btcmap-api#102 — adopts the TypeScript types generated from the API's v4 response structs. Companion to teambtcmap/btcmap-api#103 (the generator, already merged) and teambtcmap/btcmap-api#104 (moves the bindings to bindings/ts/), which should land before this PR — pnpm types:api fetches that path from master.

What this does

• Adds pnpm types:api to refresh the types: it fetches (degit) the committed bindings/ts/ directory from btcmap-api's master — no Rust toolchain or btcmap-api checkout needed; btcmap-api's CI guarantees that directory always matches its code. The resulting diff gets committed here and doubles as a readable record of the API change
• Commits the 39 generated type files under src/types/btcmap-api/ — byte-identical output of btcmap-api's devtools export-ts-types (ts-rs), never hand-edited. biome excludes the directory so format:fix can't drift it from the generator's output
• Adds a $types alias (src/types) so imports read $types/btcmap-api/SearchResponse instead of deep relative paths
• Documents the setup in AGENTS.md, including the transitional state where two Place types exist: $lib/types Place stays the app-facing type; the generated Place is the API contract shape for the fields-driven endpoints
• Migrates the first call site: the search proxy (src/routes/api/search/places/+server.ts) types its upstream response as Partial<SearchResponse> instead of an inline hand-written cast (Partial because the proxy deliberately tolerates an upstream omitting fields — covered by its existing tests)

Migration plan

Remaining call sites move to the generated types incrementally as areas of the app are touched, with $lib/types API entries becoming aliases of the generated schemas — tracked in teambtcmap/btcmap-api#102.

Test plan

• pnpm typecheck, pnpm lint — clean
• pnpm vitest run src/routes/api/search/places/server.test.ts — 7/7, including the malformed-upstream tolerance test

🤖 Generated with Claude Code

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