fix(indexer): run deno install in Dockerfile so node_modules exists at runtime
deno.json sets "nodeModulesDir": "manual", so Deno only resolves
npm: specifiers via a local ./node_modules. The previous Dockerfile
ran 'deno cache' alone, which populates the global module cache but
does not materialize node_modules — so at runtime the worker died
with ERR_MODULE_NOT_FOUND on @libsql/client/web in lib/db.ts.
Run 'deno install' first to lay down node_modules from the lockfile,
then cache the entrypoint as before.
Made-with: Cursor