Add Protocol Diagnostics page

[smithaldon1]

Closes #215

Summary

• Add a /protocol-diagnostics Workbench route and navigation entry for protocol operations.
• Show API-backed health cards for OPC-UA, MQTT, BACnet, the FIP API, and ingestion using existing FIP health, connection profile, read-only test, and process-signal endpoints.
• Show configured connection status, latest read-only test result, checked timestamp, and readable error/next-step messages.
• Add a searchable source mapping table derived from configured profile source identifiers and mapping_reference values.
• Include local Demo-Factory validation next-step commands without reading or hardcoding Demo-Factory runtime state.
• Extend Playwright config with optional API/web port overrides so e2e validation can run when default ports are already occupied.

Test Evidence

• cd apps/web && npm test - passed, 17 tests.
• cd apps/web && npm run lint - passed.
• cd apps/web && npm run typecheck - passed.
• cd apps/web && npm run build - passed; /protocol-diagnostics built as a dynamic route.
• cd apps/web && npm run test:e2e - default run first failed because http://127.0.0.1:8000/health was already occupied by an existing Docker listener.
• cd apps/web && PLAYWRIGHT_API_PORT=8001 PLAYWRIGHT_WEB_PORT=3001 PLAYWRIGHT_BASE_URL=http://127.0.0.1:3001 npm run test:e2e - passed, 1 test.
• make lint - passed; Ruff reported all checks passed.
• make typecheck - passed; compileall completed across packages and services.
• make test - passed, 266 tests.
• make docs - passed; docs are Markdown-only and no checker is configured yet.
• git diff --check and git diff --cached --check - passed.

Docs Impact

• Updated docs/LEARNING_LOG.md with what changed, why it matters, how the page loads FIP API data, how to run it, how to test it, and the next learning step.

Follow-up Work

• Add the dedicated Tag/Source Browser with explicit mapping records instead of deriving rows from connection profile source identifiers.
• Persist historical connection test results if operators need a true audit/history view rather than the current read-only diagnostics snapshot.

[smithaldon1]

Reviewed and approved for merge