ci(gitea): shared composite actions + pipeline generator for Gitea Actions

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AqpXh3hQMMaC74pTjFq4it

Gitea 1.25 cannot run reusable workflows (workflow_call), so the logic of
deploy-app.yml, smoke.yml and ci.yml moves into composite actions under
.gitea/actions/, and each repo gets a thin pipeline rendered by
tools/gitea-pipeline/render.py from repos.json. .github/workflows is left
untouched (Gitea ignores it once .gitea/workflows exists).

.gitea/actions/ci-file-size/action.yml

@@ -0,0 +1,30 @@
+name: CI - 300-line rule
+description: Fail if any tracked *.php under the given paths exceeds 300 lines (estate hard rule).
+inputs:
+  paths:
+    required: false
+    default: includes
+runs:
+  using: composite
+  steps:
+    - name: Check for PHP files over 300 lines
+      shell: bash
+      env:
+        PATHS: ${{ inputs.paths }}
+      run: |
+        set -e
+        OFFENDERS=""
+        for DIR in $PATHS; do
+          if [ ! -e "$DIR" ]; then echo "Warning: path '$DIR' does not exist - skipping."; continue; fi
+          while IFS= read -r FILE; do
+            [ -z "$FILE" ] && continue
+            LINES=$(wc -l < "$FILE")
+            if [ "$LINES" -gt 300 ]; then OFFENDERS="${OFFENDERS}${LINES} lines: ${FILE}\n"; fi
+          done < <(git ls-files -- "$DIR" | grep '\.php$' || true)
+        done
+        if [ -n "$OFFENDERS" ]; then
+          echo "::error::Files exceeding 300-line limit (estate hard rule):"
+          printf "%b" "$OFFENDERS"
+          exit 1
+        fi
+        echo "All tracked PHP files under '$PATHS' are within the 300-line limit."