refactor(runtime): centralize service agent adapters

[limityan]

Summary

• Centralize the remaining core-owned remote service/agent runtime adapters in CoreServiceAgentRuntime while keeping product behavior and wire contracts unchanged.
• Move concrete remote dialog/cancel/file/tracker host bindings, remote model catalog and session-model selection config adapters, and remote chat history persistence/message conversion adapters out of remote_server.rs.
• Keep remote_server.rs as command dispatch/routing only; it now delegates persisted remote chat loading through the owner adapter.
• Add boundary-script guards and owner tests for remote chat history shape, in-progress assistant history skipping, thumbnail compression ownership, and enhanced user-input display cleanup.
• Update architecture and module docs to clarify that this PR is a core owner-closure step, not a migration of broad persistence/workspace ownership, remote-SSH runtime, scheduler/session restore, feature matrix, or product behavior.

Behavior Boundary

• No remote command, response, DTO, feature flag, product release shape, scheduler policy, workspace-root selection, or remote-SSH behavior is changed.
• Persisted turn to mobile ChatMessage conversion preserves existing ordering, tool/thinking/text filtering, original-text display preference, image thumbnail policy, and in-progress assistant-message suppression.
• Concrete persistence reads remain core-owned; this PR only moves the remote chat history adapter from remote_server.rs into the existing core owner module.

Verification

• node scripts/check-core-boundaries.mjs
• node scripts/check-core-boundaries.mjs --self-test
• cargo test -p bitfun-core core_service_agent_runtime_owner -- --nocapture
• cargo check -p bitfun-core --features product-full
• cargo test -p bitfun-core remote_execution_prefers_unified_image_contexts_over_legacy_images -- --nocapture
• cargo test -p bitfun-services-integrations --features remote-connect
• git diff --check
• git merge-base --is-ancestor gcwing/main HEAD
• cargo check --workspace
• cargo test --workspace