refactor: optimize Dependabot configuration

- Target develop branch only (no PRs to main)
- Change from weekly to monthly updates (reduce noise)
- Reduce open PR limits (npm: 5→3, actions: 3→2, docker: 3→2)
- Group ALL dependencies by type (fewer PRs):
  - All dev dependencies in one PR
  - All production minor/patch in one PR
  - All production major in separate PR
  - All GitHub Actions in one PR
  - All Docker images in one PR

Result: Maximum 3-5 PRs per month instead of many per week

Author: kristiyan-velkov

.github/dependabot.yml

@@ -7,11 +7,12 @@ updates:
   - package-ecosystem: "npm"
     directory: "/"
     schedule:
-      interval: "weekly"
+      interval: "monthly" # Changed from weekly to monthly
       day: "monday"
       time: "09:00"
       timezone: "UTC"
-    open-pull-requests-limit: 5
+    target-branch: "develop" # Only create PRs against develop branch
+    open-pull-requests-limit: 3 # Reduced from 5 to 3
     labels:
       - "dependencies"
       - "npm"
@@ -22,15 +23,24 @@ updates:
       include: "scope"
     # Group updates for better PR management
     groups:
+      # Group ALL development dependencies into ONE PR
       development-dependencies:
         dependency-type: "development"
         update-types:
           - "minor"
           - "patch"
+          - "major" # Include major updates too
+      # Group ALL production dependencies into ONE PR
       production-dependencies:
         dependency-type: "production"
         update-types:
           - "patch"
+          - "minor"
+      # Separate group for major production updates
+      production-major-dependencies:
+        dependency-type: "production"
+        update-types:
+          - "major"
     # Version update strategy
     versioning-strategy: increase
     # Ignore specific packages if needed
@@ -49,19 +59,20 @@ updates:
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
-      interval: "weekly"
+      interval: "monthly" # Changed from weekly to monthly
       day: "monday"
       time: "09:00"
       timezone: "UTC"
-    open-pull-requests-limit: 3
+    target-branch: "develop" # Only create PRs against develop branch
+    open-pull-requests-limit: 2 # Reduced from 3 to 2
     labels:
       - "github-actions"
       - "dependencies"
       - "automated"
     commit-message:
       prefix: "ci"
       include: "scope"
-    # Group GitHub Actions updates
+    # Group ALL GitHub Actions updates into ONE PR
     groups:
       github-actions:
         patterns:
@@ -71,15 +82,21 @@ updates:
   - package-ecosystem: "docker"
     directory: "/"
     schedule:
-      interval: "weekly"
+      interval: "monthly" # Changed from weekly to monthly
       day: "monday"
       time: "09:00"
       timezone: "UTC"
-    open-pull-requests-limit: 3
+    target-branch: "develop" # Only create PRs against develop branch
+    open-pull-requests-limit: 2 # Reduced from 3 to 2
     labels:
       - "docker"
       - "dependencies"
       - "automated"
     commit-message:
       prefix: "build"
       include: "scope"
+    # Group all Docker updates into ONE PR
+    groups:
+      docker-images:
+        patterns:
+          - "*"