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feat(mcp): OAuth authentication for HTTP servers

Add file-based OAuth client provider for MCP HTTP servers
that require Bearer token authentication. The SDK handles
401 detection, metadata discovery, DCR, PKCE, token exchange,
and token refresh automatically.

- Add `auth` config to McpToolConfig (callbackUrl, storePath)
- Create FileOAuthProvider persisting state to disk
- Wire authProvider into StreamableHTTPClientTransport
- Handle UnauthorizedError with pending auth flow
- Add /mcp-auth/callback route for OAuth redirect
- Add auth example to generateConfig()

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

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