Use go.uber.org/fx to organize orchestrator's `main`

[djeebus]

This helps us break apart the main function into components, which also helps us close cleanly.

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[!NOTE] Refactors the orchestrator to an Uber FX-based modular app with graceful startup/shutdown, updates networking/storage APIs and callers, and refreshes CI/docs/dependencies.

• Orchestrator:
  • Switch to Uber FX-based IOC: add modules for grpc, cmux, health, hyperloop, network, observability, storage, sandboxes, template-manager, events, and optional clickhouse/redis.
  • Graceful startup/shutdown: draining, cmux-managed listeners, wait-on-sandboxes, dot-graph dump; add ioc.New/Validate and startup/shutdown test.
  • API changes: server.New now returns (*Server, error); hyperloopserver.NewHyperloopServer(port, logger, sandboxes) (no ctx); network Storage adds Setup(ctx); Pool.Populate(ctx) returns error; NewStorageLocal(config) signature; KV/Memory storages implement Setup; ServiceInfo constructor no longer needs ctx; Sandbox.Factory tracks active sandboxes (Wait/Add/Subtract).
• Build/Bench:
  • Update cmd/build-template and benchmarks to new network/storage signatures and error handling; return errors on pool population.
• Template Cache/Build:
  • Tolerate ENOENT on cache cleanup; add diagnostic dump utility in tests.
• CI/Docs/Config:
  • CI: enable NBD and udev rules; DEV-LOCAL steps refined; add .env.local; ignore graph.dot.
• Dependencies:
  • Add go.uber.org/fx; adjust golang.org/x/*, Docker/Testcontainers versions; scripts update e2b and add dotenv.

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