chore: add Dependabot configuration

- Add automated dependency updates for npm packages
- Add automated dependency updates for pip packages
- Add automated updates for GitHub Actions
- Configure weekly update schedule
- Add appropriate labels and commit message formats

.github/dependabot.yml

@@ -0,0 +1,42 @@
+version: 2
+updates:
+  # Frontend dependencies
+  - package-ecosystem: "npm"
+    directory: "/frontend"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 10
+    labels:
+      - "npm"
+      - "dependencies"
+    commit-message:
+      prefix: "chore"
+      prefix-development: "chore"
+      include: "scope"
+
+  # Backend dependencies
+  - package-ecosystem: "pip"
+    directory: "/backend"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 10
+    labels:
+      - "pip"
+      - "dependencies"
+    commit-message:
+      prefix: "chore"
+      prefix-development: "chore"
+      include: "scope"
+
+  # GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    labels:
+      - "github-actions"
+      - "dependencies"
+    commit-message:
+      prefix: "chore"
+      prefix-development: "chore"
+      include: "scope"