Migrate from npm to pnpm across entire project

• Update all GitHub workflow files to use pnpm instead of npm
• Replace npm commands with pnpm equivalents in devcontainer scripts
• Remove package-lock.json files and update to use pnpm-lock.yaml
• Consolidate node version references to use server/.nvmrc

.devcontainer/server/container-start-frontend.sh

@@ -3,6 +3,13 @@
 # shellcheck disable=SC1091
 source /immich-devcontainer/container-common.sh
 
+export CI=1
+log "Preparing Immich Web Frontend"
+log ""
+run_cmd pnpm --filter @immich/sdk install
+run_cmd pnpm --filter @immich/sdk build
+run_cmd pnpm --filter immich-web install
+
 log "Starting Immich Web Frontend"
 log ""
 cd "${IMMICH_WORKSPACE}/web" || (
@@ -16,7 +23,7 @@ until curl --output /dev/null --silent --head --fail "http://127.0.0.1:${IMMICH_
 done
 
 while true; do
-    run_cmd node ./node_modules/.bin/vite dev --host 0.0.0.0 --port "${DEV_PORT}"
+    run_cmd pnpm --filter immich-web exec vite dev --host 0.0.0.0 --port "${DEV_PORT}"
     log "Web crashed with exit code $?.  Respawning in 3s ..."
     sleep 3
 done