feat: automate dist recompilation on Renovate PRs and configure concurrency limit (#120)

### Summary of Changes

1. **Gitea Workflow (.gitea/workflows/recompile-dist.yaml)**:
   - Automates recompilation of dist/index.js on Renovate PRs.
   - Adds loop-prevention check for [skip compile].
2. **Renovate Configuration (
enovate.json)**:
   - Configures branchConcurrentLimit: 2 and prConcurrentLimit: 2.
   - Adds gitIgnoredAuthors for automated bot commits.
   - Adds rebaseWhen: 'behind-base-branch'.
   - Removes postUpgradeTasks.
3. **Test Workflow (.gitea/workflows/test.yaml)**:
   - Added pull_request trigger.
4. **Gitea-Only Setup**:
   - Removed .github/ workflows to keep workflow execution strictly on Gitea.
5. **Preferences (GEMINI.md)**:
   - Documented strict pnpm/pnpx rule.
6. **Tests**:
   - Added afterEach import in __tests__/index.test.js.

Reviewed-on: #120
Reviewed-by: LLMReview <27+autoreview@noreplay.horstenkamp.eu>

renovate.json

@@ -5,20 +5,11 @@
     "config:recommended",
     ":automergeLinters"
   ],
-  "packageRules": [
-    {
-      "matchManagers": [
-        "pnpm"
-      ],
-      "postUpgradeTasks": {
-        "commands": [
-          "pnpm install --frozen-lockfile",
-          "pnpm run build"
-        ],
-        "fileFilters": [
-          "dist/index.js"
-        ]
-      }
-    }
+  "rebaseWhen": "behind-base-branch",
+  "branchConcurrentLimit": 2,
+  "prConcurrentLimit": 2,
+  "gitIgnoredAuthors": [
+    "github-actions[bot]@users.noreply.github.com",
+    "bot@horstenkamp.eu"
   ]
 }