Add AWS S3 and Aurora tools to wb-mcp-server (#424)

* Add AWS S3 and Aurora tools to wb-mcp-server

Adds 12 new MCP tools for AWS resource management:
- S3: list_objects, read_file, write_file, copy
- Aurora: query, list_tables, describe_table, resolve_connection
- Resource lifecycle: create_s3_folder, create_aurora_database,
  create_s3_external_bucket, workspace_configure_aws

Fixes s3_copy to use resource-name-based auth (matching other S3
tools) with cross-resource temp-file bridge. Fixes ensureAWSConfig
to prefer the config file matching the current workspace UUID.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Pre-install web frameworks and expose dashboard port

- Dockerfile: add fastapi, uvicorn, flask, flask-cors, plotly, pandas,
  boto3, psycopg2-binary so dashboard apps work without pip install
- docker-compose: expose port 8080 for dashboard/API serving
- install.sh: bake read-only MCP permission allowlist into Claude settings

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Update DASHBOARD_BUILDER skill for AWS + reduced prompts

- Use MCP tools (app_get_url) instead of wb app list for app UUID
- Mark packages as pre-installed, skip pip install unless import fails
- Fix Flask route decorators (leading slash required)
- Clarify JS fetch relative path rule vs Flask route rule
- Add Aurora IAM auth template and MCP-first query approach
- Add S3 data dashboard template
- Keep BigQuery template for GCP workspaces
- Remove emoji from headers for cleaner output

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* added back several lines in DASHBOARD_BUILDER.md that likely should not have been removed

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Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: PeterSu92