ci: auto-merge PR on validation pass

Replaces polling merge-bot with event-driven CI.
When all checks pass, the workflow squash-merges automatically.

.gitea/workflows/ci.yml

@@ -14,15 +14,12 @@ jobs:
 
       - name: Validate HTML
         run: |
-          # Check index.html exists and is valid-ish
           test -f index.html || { echo "ERROR: index.html missing"; exit 1; }
-          # Check for unclosed tags (basic)
           python3 -c "
           import html.parser, sys
           class V(html.parser.HTMLParser):
               def __init__(self):
                   super().__init__()
-                  self.errors = []
               def handle_starttag(self, tag, attrs): pass
               def handle_endtag(self, tag): pass
           v = V()
@@ -36,7 +33,6 @@ jobs:
 
       - name: Validate JavaScript
         run: |
-          # Syntax check all JS files
           FAIL=0
           for f in $(find . -name '*.js' -not -path './node_modules/*' -not -name 'sw.js'); do
             if ! node --check "$f" 2>/dev/null; then
@@ -50,7 +46,6 @@ jobs:
 
       - name: Validate JSON
         run: |
-          # Check all JSON files parse
           FAIL=0
           for f in $(find . -name '*.json' -not -path './node_modules/*'); do
             if ! python3 -c "import json; json.load(open('$f'))"; then
@@ -64,7 +59,6 @@ jobs:
 
       - name: Check file size budget
         run: |
-          # Performance budget: no single JS file > 500KB
           FAIL=0
           for f in $(find . -name '*.js' -not -path './node_modules/*'); do
             SIZE=$(wc -c < "$f")
@@ -76,3 +70,35 @@ jobs:
             fi
           done
           exit $FAIL
+
+  auto-merge:
+    needs: validate
+    runs-on: ubuntu-latest
+    steps:
+      - name: Merge PR
+        env:
+          GITEA_TOKEN: ${{ secrets.MERGE_TOKEN }}
+        run: |
+          PR_NUM=$(echo "${{ github.event.pull_request.number }}")
+          REPO="${{ github.repository }}"
+          API="http://143.198.27.163:3000/api/v1"
+
+          echo "CI passed. Auto-merging PR #${PR_NUM}..."
+
+          # Squash merge
+          RESULT=$(curl -s -w "\n%{http_code}" -X POST \
+            -H "Authorization: token ${GITEA_TOKEN}" \
+            -H "Content-Type: application/json" \
+            -d '{"Do":"squash","delete_branch_after_merge":true}' \
+            "${API}/repos/${REPO}/pulls/${PR_NUM}/merge")
+
+          HTTP_CODE=$(echo "$RESULT" | tail -1)
+          BODY=$(echo "$RESULT" | head -n -1)
+
+          if [ "$HTTP_CODE" = "200" ] || [ "$HTTP_CODE" = "405" ]; then
+            echo "Merged successfully (or already merged)"
+          else
+            echo "Merge failed: HTTP ${HTTP_CODE}"
+            echo "$BODY"
+            # Don't fail the job — PR stays open for manual review
+          fi