fix: simplify pipeline - build app with self-contained Dockerfile

Problem: Docker-in-Docker doesn't work in Woodpecker alpine image

Solution:
- Dockerfile now self-contained (installs Node.js, bun directly)
- No dependency on external base image
- Build always works
- Simpler and more reliable

Trade-off:
- Build time: ~8-10 minutes (but reliable)
- No complex base image management
- Easier to maintain

For future optimization:
- Use .woodpecker-base.yml separately to build base
- Then switch back to base image usage
- But for now, this JUST WORKS

.woodpecker.yml

@@ -1,5 +1,5 @@
 # Woodpecker CI/CD Pipeline - Peikarband Landing
-# Application build pipeline
+# Simple and efficient pipeline
 
 variables:
   - &helm_image 'alpine/helm:latest'
@@ -9,60 +9,7 @@ when:
 
 pipeline:
   # ============================================
-  # Stage 1: Check & Build Base (conditional)
-  # ============================================
-  
-  ensure-base-image:
-    image: alpine:latest
-    commands:
-      - apk add --no-cache curl docker
-      - |
-        echo "═══════════════════════════════════════"
-        echo "  Checking Base Image"
-        echo "═══════════════════════════════════════"
-        
-        REGISTRY="hub.peikarband.ir"
-        BASE_REPO="peikarband/base"
-        BASE_TAG="latest"
-        
-        # Login to registry
-        echo "$HARBOR_PASSWORD" | docker login "$REGISTRY" -u "$HARBOR_USERNAME" --password-stdin
-        
-        # Try to pull base image
-        if docker pull "$REGISTRY/$BASE_REPO:$BASE_TAG" 2>/dev/null; then
-          echo "✅ Base image found in registry"
-          echo "   Skipping base build (saves ~10 minutes)"
-          exit 0
-        fi
-        
-        echo "⚠️  Base image not found - building it now..."
-        echo ""
-        echo "═══════════════════════════════════════"
-        echo "  Building Base Image"
-        echo "═══════════════════════════════════════"
-        
-        # Build base image
-        docker buildx create --use --name builder || docker buildx use builder
-        
-        docker buildx build \
-          -f docker/Dockerfile.base \
-          -t "$REGISTRY/$BASE_REPO:latest" \
-          -t "$REGISTRY/$BASE_REPO:python3.11-node20" \
-          --build-arg PYTHON_VERSION=3.11 \
-          --build-arg NODE_VERSION=20 \
-          --platform linux/amd64 \
-          --push \
-          .
-        
-        echo "✅ Base image built and pushed successfully"
-    
-    secrets: [HARBOR_USERNAME, HARBOR_PASSWORD]
-    when:
-      event: [push, tag]
-      branch: [main, develop, feature/restructure-project]
-
-  # ============================================
-  # Stage 2: Build Application Image
+  # Build Application Image (with fallback to python base)
   # ============================================
   
   build-and-push-app:
@@ -107,7 +54,7 @@ pipeline:
       branch: [main, develop, feature/restructure-project]
 
   # ============================================
-  # Stage 3: Verify Push
+  # Verify Push
   # ============================================
   
   verify-push:
@@ -169,36 +116,8 @@ pipeline:
       - echo "Branch:" "${CI_COMMIT_BRANCH}"
       - echo "Commit:" "${CI_COMMIT_SHA:0:8}"
       - echo ""
-      - echo "Please check the logs above for details"
+      - echo "Please check the logs above"
       - echo "════════════════════════════════════════"
     when:
       event: [push, tag]
       status: failure
-
-  # ============================================
-  # Commented stages (enable when needed)
-  # ============================================
-  
-  # helm-lint:
-  #   image: *helm_image
-  #   commands:
-  #     - helm lint helm/peikarband
-  #   when:
-  #     event: [push, pull_request, tag]
-  
-  # deploy-staging:
-  #   image: *helm_image
-  #   commands:
-  #     - apk add --no-cache kubectl
-  #     - echo "$KUBECONFIG_STAGING" | base64 -d > /tmp/kubeconfig
-  #     - export KUBECONFIG=/tmp/kubeconfig
-  #     - helm upgrade --install peikarband-staging helm/peikarband \
-  #         --namespace staging \
-  #         --create-namespace \
-  #         --set image.repository=hub.peikarband.ir/peikarband/landing \
-  #         --set image.tag=${CI_COMMIT_SHA:0:8} \
-  #         --wait --timeout 5m
-  #   secrets: [KUBECONFIG_STAGING]
-  #   when:
-  #     event: push
-  #     branch: [main, develop]