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

e2e/.gitignore

@@ -3,3 +3,4 @@ node_modules/
 /playwright-report/
 /blob-report/
 /playwright/.cache/
+/dist

e2e/src/utils.ts

@@ -79,7 +79,7 @@ export const tempDir = tmpdir();
 export const asBearerAuth = (accessToken: string) => ({ Authorization: `Bearer ${accessToken}` });
 export const asKeyAuth = (key: string) => ({ 'x-api-key': key });
 export const immichCli = (args: string[]) =>
-  executeCommand('node', ['node_modules/.bin/immich', '-d', `/${tempDir}/immich/`, ...args]).promise;
+  executeCommand('pnpm', ['exec', 'immich', '-d', `/${tempDir}/immich/`, ...args], { cwd: '../cli' }).promise;
 export const immichAdmin = (args: string[]) =>
   executeCommand('docker', ['exec', '-i', 'immich-e2e-server', '/bin/bash', '-c', `immich-admin ${args.join(' ')}`]);
 export const specialCharStrings = ["'", '"', ',', '{', '}', '*'];