chore: refactor spam filter (#671)

Signed-off-by: Huamin Chen <[email protected]>

Author: rootfs

.github/workflows/anti-spam-comment-moderator.yml

@@ -0,0 +1,51 @@
+name: Anti-Spam Filter (Hidden Logic)
+
+on:
+  issues:
+    types: [opened, edited]
+  pull_request:
+    types: [opened, edited]
+  issue_comment:
+    types: [created, edited]
+  pull_request_review_comment:
+    types: [created, edited]
+
+permissions:
+  issues: write
+  pull-requests: write
+  contents: write
+
+jobs:
+  moderate:
+    if: ${{ github.event.action == 'created' || github.event.action == 'edited' || github.event.action == 'opened' }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Run spam filter
+        uses: actions/github-script@v7
+        env:
+          # The entire spam detection logic is stored here
+          SPAM_DETECTION_SCRIPT: ${{ secrets.SPAM_DETECTION_SCRIPT }}
+        with:
+          script: |
+            // Load and execute the spam detection script from secret
+            const detectionScript = process.env.SPAM_DETECTION_SCRIPT;
+            
+            if (!detectionScript) {
+              core.error("SPAM_DETECTION_SCRIPT secret not found!");
+              core.setFailed("Spam filter not configured");
+              return;
+            }
+            
+            try {
+              // Execute the hidden script
+              // The script has access to: github, context, core
+              const detectSpam = eval(detectionScript);
+              
+              // Run the detection
+              await detectSpam(github, context, core);
+              
+            } catch (err) {
+              core.error(`Spam filter error: ${err.message}`);
+              core.setFailed(`Filter execution failed: ${err.message}`);
+            }
+