feat: add PGlite as a client-side database implementation

[Copilot]

Adds PGlite — a WASM-compiled PostgreSQL running entirely in the browser with IndexedDB persistence — as a new benchmark implementation alongside the existing pouchdb, rxdb, watermelondb, etc.

New project: projects/pglite

• database.service.ts — bootstraps PGlite('idb://chat-db'), creates users/messages tables with indexes, and wires up PostgreSQL NOTIFY/LISTEN triggers for reactive change propagation
• app.logic.ts — implements LogicInterface via parameterized SQL queries; uses ILIKE for search, ON CONFLICT DO NOTHING for idempotent inserts, trigger-driven Subject<void> observables to re-run queries on data changes

// Change feed via pg NOTIFY triggers + PGlite's listen()
await db.listen('messages_change', () => messagesSubject.next());

// Reactive query pattern
this.db.messages$.pipe(
    startWith(undefined),
    switchMap(async () => db.query(`SELECT ... WHERE ... ORDER BY "createdAt" DESC LIMIT 1`, [id1, id2]))
)

Config / tooling

• Added @electric-sql/pglite@0.4.3 dependency
• Registered pglite project in angular.json (mirrors pouchdb config)
• Added build:pglite, dev:pglite, start:pglite, client:pglite, test:pglite, analyze:pglite scripts to package.json

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• mapbox-node-binary.s3.amazonaws.com
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node node /home/REDACTED/work/client-side-databases/client-side-databases/node_modules/.bin/node-pre-gyp install --fallback-to-build down/node_modules/.bin/node-gyp-build-test (dns block)
• package.cli.amplify.aws
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node node ./lib/install.js -o Release/obj.target/sqlite3/gen/sqlite-autoconf-3310100/sqlite3.o (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)