docs(github): establish repository governance and automation workflows (#359)

Introduce essential GitHub repository files to standardize community
contributions and automate maintenance tasks.

- Add AI usage policy and contribution guidelines
- Implement issue and pull request templates for consistent reporting
- Configure Dependabot for automated dependency updates
- Add workflow for automated PR labeling
- Include funding information and repository metadata

.github/dependabot.yml

@@ -0,0 +1,14 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: daily
+  - package-ecosystem: "pip"
+    directory: "/"
+    schedule:
+      interval: weekly
+    groups:
+      dependencies:
+        patterns:
+          - "*"