fix(api): proxy foreground run attach upgrades

[G4614]

Fix foreground cloud run by routing the main-session WebSocket attach path through the API upgrade proxy.

Test plan:

• npx jest --config api/jest.config.ts --runInBand api/src/boxlite-rest/boxlite-rest-routing.spec.ts api/src/boxlite-rest/boxlite-ws-proxy.service.spec.ts
• Added coverage for main-session and execution attach path matching and rewriting.
• Existing strict AutoResume test remains a baseline failure on current main.

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