refactor(remote-connect): move tracker state to integrations

[limityan]

Summary

• move remote session tracker state, tracker event reduction, agent-type alias mapping, and remote tool preview slimming into bitfun-services-integrations
• keep core as the remote-connect product runtime assembly owner for coordinator subscription, session restore, terminal pre-warm, dispatcher state, and dialog submission routing
• add owner-crate contract tests plus boundary/docs guardrails so tracker state does not drift back into core

Behavior Boundary

• no intended change to remote message execution, queueing, cancellation decisions, terminal pre-warm, session restore, or image context execution
• AgentSubmissionPort still rejects generic attachments; this PR does not enable multimodal submission through the runtime port
• core retains the EventSubscriber adapter and runtime dispatcher/product routing only

Validation

• node scripts/check-core-boundaries.mjs
• git diff --check
• rustfmt --edition 2024 --check src/crates/services-integrations/src/remote_connect.rs src/crates/services-integrations/tests/remote_connect_contracts.rs src/crates/core/src/service/remote_connect/remote_server.rs
• cargo test -p bitfun-services-integrations --features remote-connect
• cargo test -p bitfun-core remote_connect -- --nocapture
• cargo check --workspace