feat: Add Dependabot config and README badges

- Add Dependabot for Go modules, GitHub Actions, and Python dependencies
- Add badges: Go version, release, CI status, Go Report Card, license, PyPI
- Weekly automated security and dependency updates

Amp-Thread-ID: https://ampcode.com/threads/T-ea1982a4-56dc-482a-8c00-00963623cd64
Co-authored-by: Amp <amp@ampcode.com>

.github/dependabot.yml

@@ -0,0 +1,32 @@
+version: 2
+updates:
+  # Go modules
+  - package-ecosystem: "gomod"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 5
+    labels:
+      - "dependencies"
+      - "go"
+
+  # GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 5
+    labels:
+      - "dependencies"
+      - "ci"
+
+  # Python (beads-mcp)
+  - package-ecosystem: "pip"
+    directory: "/integrations/beads-mcp"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 5
+    labels:
+      - "dependencies"
+      - "python"
+      - "mcp"