[CPL-20411] use execution ID

[oshchyhol]

https://railsware.atlassian.net/browse/CPL-20411

Changes

• build and validate tool schemas with zod
• use executionId when caching data/schema files

How to test

• run MCP inspector in UI mode
• run tools with MCP inspector in CLI mode:

# get-data
npx @modelcontextprotocol/inspector --cli npm run dev --method tools/call --tool-name get-data --tool-arg dataflowId=<put_your_dataflow_ID_here> --tool-arg executionId=<put_your_execution_ID_here> --tool-arg query="SELECT * FROM data"

# get-schema
npx @modelcontextprotocol/inspector --cli npm run dev --method tools/call --tool-name get-schema --tool-arg dataflowId=<put_your_dataflow_ID_here> --tool-arg executionId=<put_your_execution_ID_here>

• test the PR image: ghcr.io/railsware/coupler-io-mcp-server:pr-7 against staging or local env

[oshchyhol]

Merging to quickly fix the edge image build.