multi-tenant Phase 2: per-user Google OAuth

- workspace-mcp: add proxy.py (port 8080) that reads X-Actor-Id header,
  fetches per-user Google credentials from Secrets Manager, writes creds
  file, sets USER_GOOGLE_EMAIL, proxies to workspace-mcp on port 8081
- workspace-mcp: update bootstrap to start workspace-mcp on 8081 + proxy on 8080
- workspace-mcp: update Dockerfile to include proxy.py
- oauth-handler Lambda: new Lambda with /oauth/start + /oauth/callback
  routes; exchanges Google auth code, stores tokens in Secrets Manager
  at agent-claw/google-credentials/{actor_id_safe}, updates DynamoDB
- CDK: add OAuthHandler Lambda + GET /oauth/start + /oauth/callback routes
- CDK: remove shared google-workspace-credentials secret; add per-user
  secret IAM grants (agent-claw/google-credentials/*) for workspace-mcp
  role, runtime1 role, and oauth-handler role
- CDK: output OAuthStartUrl + OAuthRedirectUri
- agent-runner: pass google_email in user_profile payload
- main.py: pass actor_id as X-Actor-Id header in workspace-mcp MCP calls;
  skip workspace-mcp if user has no google_email; add connect_google_account
  tool that generates OAuth URL for the current user
- main.py: include google_email in user_context for system prompt
- agentcore.json: add OAUTH_START_URL env var for agent runtime

cdk/cdk.out/manifest.json

@@ -18,7 +18,7 @@
         "validateOnSynth": false,
         "assumeRoleArn": "arn:${AWS::Partition}:iam::495395224548:role/cdk-hnb659fds-deploy-role-495395224548-us-east-1",
         "cloudFormationExecutionRoleArn": "arn:${AWS::Partition}:iam::495395224548:role/cdk-hnb659fds-cfn-exec-role-495395224548-us-east-1",
-        "stackTemplateAssetObjectUrl": "s3://cdk-hnb659fds-assets-495395224548-us-east-1/2765094d543818b111d837ea62bad41260a47615c5b99bc608a58e99f24d5b85.json",
+        "stackTemplateAssetObjectUrl": "s3://cdk-hnb659fds-assets-495395224548-us-east-1/fdf1ff81e9e0ded898f1c1d03a2bb8bbe0bbf63689426c24072f179b49b527c6.json",
         "requiresBootstrapStackVersion": 6,
         "bootstrapStackVersionSsmParameter": "/cdk-bootstrap/hnb659fds/version",
         "additionalDependencies": [