fix(sdk): expose network visibility on BoxInfo and REST responses

[G4614]

Fixes POL-311. Stacked on boxlite-ai#1206 (POL-207) — based here on
G4614/boxlite because boxlite-ai#1206's branch isn't pushed to boxlite-ai/boxlite. Once
boxlite-ai#1206 merges to main, this should be retargeted to boxlite-ai/boxlite:main.

Before

SDK rt.get_info()/list_info()
  -> RestRuntime::get_info()          [src/boxlite/src/rest/runtime.rs]
  -> GET /v1/boxes/{id}
       apps/api boxToBoxResponse(box) [box-to-box.mapper.ts]  ← BUG: box.public
         already exists on BoxDto but never reaches the wire response
  -> BoxResponse::to_box_info()       [src/boxlite/src/rest/types.rs]
       network: None                  ← BUG: hardcoded, regardless of server data
  -> BoxInfo.network == None, hasattr(info, 'public') == False

Self-hosted boxlite serve had the same gap: it always computes BoxInfo.network
locally but never put it on the wire (BoxResponse in commands/serve/types.rs
had no network field).

After

SDK rt.get_info()/list_info()
  -> GET /v1/boxes/{id}
       apps/api boxToBoxResponse(box)
         -> network: { inbound: { mode: box.public ? enabled : disabled },
                        outbound: { mode: ..., allow_net: ... } }
  -> BoxResponse::to_box_info()
       network: self.network.clone()
  -> BoxInfo.network.inbound.mode  ==  the box's visibility

Reuses the NetworkInfo{ outbound, inbound } shape from boxlite-ai#1206 (POL-207) instead
of adding a separate public: bool — inbound.mode == Enabled is the visibility
signal, so there's one field to keep in sync instead of two.

Test plan

• cargo test -p boxlite --lib --features rest rest::types::tests — 19/19 pass,
  including new test_box_response_to_box_info_carries_network_visibility
• Two-side verification: reverted to_box_info()'s new line, new test failed at
  "network metadata should survive conversion"; restored, passes
• cargo check -p boxlite --features rest -p boxlite-cli --tests — clean
• yarn nx test api — 566 passed, 72 skipped, 0 failed (full api suite,
  including 4 new cases in box-to-box.mapper.spec.ts)

🤖 Generated with Claude Code

[G4614]

Superseded by boxlite-ai#1364 (opened against upstream main instead of the fork).