fix(ci): trigger workflow on main branch to enable :latest tag

Changes:
- Create Gitea workflow for ai-stack-deployer
- Trigger on main branch (default branch)
- Use oussamadouhou + REGISTRY_TOKEN for authentication
- Build from ./Dockerfile

This enables :latest tag creation via {{is_default_branch}}.

Tags created:
- git.app.flexinit.nl/oussamadouhou/ai-stack-deployer:latest
- git.app.flexinit.nl/oussamadouhou/ai-stack-deployer:<sha>

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

package.json

@@ -0,0 +1,23 @@
+{
+  "name": "ai-stack-deployer",
+  "version": "0.1.0",
+  "description": "Self-service portal for deploying personal OpenCode AI stacks",
+  "type": "module",
+  "scripts": {
+    "dev": "bun run --hot src/index.ts",
+    "start": "bun run src/index.ts",
+    "mcp": "bun run src/mcp-server.ts",
+    "build": "bun build src/index.ts --outdir=dist --target=bun",
+    "typecheck": "tsc --noEmit"
+  },
+  "dependencies": {
+    "@modelcontextprotocol/sdk": "^1.25.2",
+    "hono": "^4.11.3"
+  },
+  "devDependencies": {
+    "@types/bun": "latest",
+    "typescript": "^5.0.0"
+  },
+  "author": "Oussama Douhou",
+  "license": "UNLICENSED"
+}