Add connect method

[jakubno]

Note

Adds POST /sandboxes/{sandboxID}/connect to return/resume sandboxes and extend TTL, updates spec/types/clients, deprecates resume, and adds integration tests.

• API/Handlers:
  • Add POST /sandboxes/{sandboxID}/connect handler PostSandboxesSandboxIDConnect to return running sandbox (200) or resume from snapshot (201) and extend TTL; validates timeout vs team limits and handles state transitions.
• OpenAPI/Generated Code:
  • Define ConnectSandbox schema and request body PostSandboxesSandboxIDConnectJSONRequestBody.
  • Expose new route in ServerInterface, middleware, and Gin router in packages/api/internal/api/api.gen.go.
  • Embed updated spec (spec.gen.go) and types (types.gen.go).
  • Mark POST /sandboxes/{sandboxID}/resume as deprecated.
  • Generate client methods, request builders, and response parsers for the connect endpoint in test client (tests/integration/internal/api/client.gen.go) and models (models.gen.go).
• Tests:
  • Add sandbox_connect_test.go covering paused/running, TTL extension, not-found, oversized timeout, and concurrent connects.
  • Add sandbox_refresh_test.go for TTL refresh behavior.
  • Replace sandbox_set_timeout_test.go with sandbox_timeout_test.go consolidating timeout cases.

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[linear]

ENG-3232 Add connect method to handle reconnect correctly

[ValentaTomas]

Please sync in https://e2b-team.slack.com/archives/C026MLBNSKC/p1761752064740269?thread_ts=1761729689.300479&cid=C026MLBNSKC before merging.