feat(sdk): use config file as single source of truth, remove env var fallbacks (#19409)

## Summary

- **Config as source of truth**: `~/.twenty/config.json` is now the
single source of truth for SDK authentication — env var fallbacks have
been removed from the config resolution chain.
- **Test instance support**: `twenty server start --test` spins up a
dedicated Docker instance on port 2021 with its own config
(`config.test.json`), so integration tests don't interfere with the dev
environment.
- **API key auth for marketplace**: Removed `UserAuthGuard` from
`MarketplaceResolver` so API key tokens (workspace-scoped) can call
`installMarketplaceApp`.
- **CI for example apps**: Added monorepo CI workflows for `hello-world`
and `postcard` example apps to catch regressions.
- **Simplified CI**: All `ci-create-app-e2e` and example app workflows
now use a shared `spawn-twenty-app-dev-test` action (Docker-based)
instead of building the server from source. Consolidated auth env vars
to `TWENTY_API_URL` + `TWENTY_API_KEY`.
- **Template publishing fix**: `create-twenty-app` template now
correctly preserves `.github/` and `.gitignore` through npm publish
(stored without leading dot, renamed after copy).

## Test plan

- [x] CI SDK (lint, typecheck, unit, integration, e2e) — all green
- [x] CI Example App Hello World — green
- [x] CI Example App Postcard — green
- [x] CI Create App E2E minimal — green
- [x] CI Front, CI Server, CI Shared — green

packages/twenty-sdk/src/cli/utilities/server/docker-container.ts

@@ -1,13 +1,15 @@
 import { execSync } from 'node:child_process';
 
 export const CONTAINER_NAME = 'twenty-app-dev';
+export const TEST_CONTAINER_NAME = 'twenty-app-dev-test';
 export const IMAGE = 'twentycrm/twenty-app-dev:latest';
 export const DEFAULT_PORT = 2020;
+export const DEFAULT_TEST_PORT = 2021;
 
-export const isContainerRunning = (): boolean => {
+export const isContainerRunning = (containerName = CONTAINER_NAME): boolean => {
   try {
     const result = execSync(
-      `docker inspect -f '{{.State.Running}}' ${CONTAINER_NAME}`,
+      `docker inspect -f '{{.State.Running}}' ${containerName}`,
       { encoding: 'utf-8', stdio: ['pipe', 'pipe', 'ignore'] },
     ).trim();
 
@@ -17,24 +19,27 @@ export const isContainerRunning = (): boolean => {
   }
 };
 
-export const getContainerPort = (): number => {
+export const getContainerPort = (containerName = CONTAINER_NAME): number => {
+  const defaultPort =
+    containerName === TEST_CONTAINER_NAME ? DEFAULT_TEST_PORT : DEFAULT_PORT;
+
   try {
     const result = execSync(
-      `docker inspect -f '{{range .Config.Env}}{{println .}}{{end}}' ${CONTAINER_NAME}`,
+      `docker inspect -f '{{range .Config.Env}}{{println .}}{{end}}' ${containerName}`,
       { encoding: 'utf-8', stdio: ['pipe', 'pipe', 'ignore'] },
     );
 
     const match = result.match(/^NODE_PORT=(\d+)$/m);
 
-    return match ? parseInt(match[1], 10) : DEFAULT_PORT;
+    return match ? parseInt(match[1], 10) : defaultPort;
   } catch {
-    return DEFAULT_PORT;
+    return defaultPort;
   }
 };
 
-export const containerExists = (): boolean => {
+export const containerExists = (containerName = CONTAINER_NAME): boolean => {
   try {
-    execSync(`docker inspect ${CONTAINER_NAME}`, {
+    execSync(`docker inspect ${containerName}`, {
       stdio: ['pipe', 'pipe', 'ignore'],
     });