feat: add Fetch and Sequential Thinking MCP sidecars

Add two new MCP (Model Context Protocol) sidecars to enable web content fetching
and structured problem-solving capabilities:

- **Fetch MCP**: Web content fetching and HTML to markdown conversion on port 8082
- **Sequential Thinking MCP**: Structured thinking and problem-solving processes on port 8083

Both sidecars are enabled by default and use the official MCP Docker images
(mcp/fetch and mcp/sequentialthinking) with fastmcp SSE transport.

Changes:
- Add fetch and sequentialthinking sidecars to values.yaml
- Add sidecar containers to deployment.yaml template
- Update .mcp.json with new server endpoints
- Update CLAUDE.md documentation with new sidecar details

Closes #43, #44

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

chart/values.yaml

@@ -108,6 +108,36 @@ mcp:
           memory: "256Mi"
           cpu: "500m"
 
+    # Web content fetching capabilities
+    fetch:
+      enabled: true
+      image:
+        repository: mcp/fetch
+        tag: latest
+      port: 8082
+      resources:
+        requests:
+          memory: "64Mi"
+          cpu: "50m"
+        limits:
+          memory: "256Mi"
+          cpu: "500m"
+
+    # Sequential thinking and problem-solving
+    sequentialthinking:
+      enabled: true
+      image:
+        repository: mcp/sequentialthinking
+        tag: latest
+      port: 8083
+      resources:
+        requests:
+          memory: "64Mi"
+          cpu: "50m"
+        limits:
+          memory: "256Mi"
+          cpu: "500m"
+
     # Home Assistant smart home control
     homeassistant:
       enabled: false  # Requires HOMEASSISTANT_URL and HOMEASSISTANT_TOKEN