refactor(host): move chat_provider_llm to op-web-daemon (Phase 2 leaf)

The LlmClient adapter bridging op-orchestrator's LLM trait to op-ai chat
providers. Promoted to pub; 3 consumers (web_chat_standard, chat_intent,
chat_session_launch) repointed. No dep/lock change.

crates/op-host-desktop/src/chat_intent.rs

@@ -50,7 +50,7 @@ use op_editor_core::EditorState;
 use op_orchestrator::{AppendContext, DesignRequest};
 
 use op_web_daemon::chat_canvas_tools::UiChatToolExecutor;
-use crate::chat_provider_llm::ChatProviderLlmClient;
+use op_web_daemon::chat_provider_llm::ChatProviderLlmClient;
 use crate::design_session::{run_design_worker, DesignCmdReq, DesignDelta};
 
 /// Internal host-op name the modify worker sends over the chat tool

crates/op-host-desktop/src/chat_session_launch.rs

@@ -19,7 +19,7 @@ use op_web_daemon::chat_canvas_tools::{chat_tool_channel, chat_tool_defs, ChatTo
 use crate::chat_claude::ClaudeCodeProvider;
 use crate::chat_copilot::CopilotProvider;
 use crate::chat_http_server::OpenCodeProvider;
-use crate::chat_provider_llm::ChatProviderLlmClient;
+use op_web_daemon::chat_provider_llm::ChatProviderLlmClient;
 use crate::chat_subprocess::SubprocessProvider;
 use crate::chat_system_prompt::{
     build_agent_system_prompt, build_chat_system_prompt, chat_history_from_transcript,

crates/op-host-desktop/src/main.rs

@@ -15,7 +15,6 @@ mod chat_claude;
 mod chat_copilot;
 mod chat_http_server;
 mod chat_intent;
-mod chat_provider_llm;
 mod chat_runtime;
 mod chat_session;
 mod chat_subprocess;

crates/op-host-desktop/src/web_chat_standard.rs

@@ -21,7 +21,7 @@ use op_orchestrator::{
 use serde_json::Value;
 
 use crate::ai_proxy::AiStreamRequest;
-use crate::chat_provider_llm::ChatProviderLlmClient;
+use op_web_daemon::chat_provider_llm::ChatProviderLlmClient;
 use crate::pre_validator::LintPreValidator;
 use crate::web_canvas_server::{SseHub, WebCanvasState};
 

crates/op-web-daemon/src/lib.rs

@@ -15,6 +15,7 @@
 
 // Phase 2 — host-free leaf modules.
 pub mod chat_canvas_tools;
+pub mod chat_provider_llm;
 pub mod chat_spawn;
 pub mod chat_subprocess_quirks;
 pub mod web_static;