fix: update Woodpecker CI syntax to new format

Fixes:
✅ pipeline: → steps: (deprecated)
✅ secrets: → environment: with from_secret (deprecated)

Now compatible with latest Woodpecker!

.woodpecker.yml

@@ -8,7 +8,7 @@ variables:
 when:
   - event: [push, pull_request, tag, manual]
 
-pipeline:
+steps:
   # ============================================
   # Ensure Base Image Exists
   # ============================================
@@ -145,7 +145,12 @@ pipeline:
           exit 1
         fi
     
-    secrets: [HARBOR_USERNAME, HARBOR_PASSWORD]
+    environment:
+      HARBOR_USERNAME:
+        from_secret: HARBOR_USERNAME
+      HARBOR_PASSWORD:
+        from_secret: HARBOR_PASSWORD
+    
     when:
       event: [push, tag]
       branch: [main, develop, feature/restructure-project]