chore(ci): add Dependabot for gomod and github-actions

Weekly schedule with dependency labels and 10 PR limit.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Zie619

.github/dependabot.yml

@@ -0,0 +1,16 @@
+version: 2
+updates:
+  - package-ecosystem: "gomod"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    labels:
+      - "dependencies"
+    open-pull-requests-limit: 10
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    labels:
+      - "dependencies"
+    open-pull-requests-limit: 10