feat(web): checkpoint web app init

- frontend (Vite/React) + server (Hono/Drizzle) scaffold under web/
- eeschema WASM embind kicadOpenFile hook + programmatic open-flow
- skip KiCad first-run setup wizard by seeding default config in preRun
- dev: auto-sync output/ WASM artifacts into tests/apps/kicad via link-wasm

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web/.env.example

@@ -0,0 +1,29 @@
+# ---------------------------------------------------------------------------
+# Copy to web/.env and adjust as needed.  docker-compose and the server both
+# read this file.
+# ---------------------------------------------------------------------------
+
+# --- Postgres (docker-compose) ---
+POSTGRES_USER=kicad
+POSTGRES_PASSWORD=kicad
+POSTGRES_DB=kicad_web
+# Non-default host port to avoid colliding with a local Postgres on 5432.
+POSTGRES_PORT=54329
+
+# --- Server ---
+PORT=3050
+# Connection string MUST match the POSTGRES_* values + port above.
+DATABASE_URL=postgres://kicad:kicad@localhost:54329/kicad_web
+# Where uploaded project file bytes are stored by the local-disk FileStorage.
+STORAGE_ROOT=./.data/storage
+# Owner namespace used while there is no auth (seeded on first migrate).
+DEFAULT_OWNER_SLUG=default
+# Browser origin allowed to call the API (the Vite dev server, non-default port).
+CORS_ORIGIN=http://localhost:3048
+
+# --- Frontend (Vite, must be VITE_-prefixed) ---
+VITE_API_BASE_URL=http://localhost:3050
+# SAME-ORIGIN: artifacts are smart-copied into public/wasm on `dev` and served by
+# Vite at /wasm. Required because KiCad WASM pthread workers can't be cross-origin.
+# For prod, set to a CDN URL whose origin also satisfies the worker/COEP rules.
+VITE_WASM_ASSET_BASE_URL=/wasm