feat(server): refactor copilot (#14892)

#### PR Dependency Tree


* **PR #14892** 👈

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packages/backend/native/src/llm/mod.rs

@@ -0,0 +1,50 @@
+mod action;
+mod contract_schema;
+mod core;
+mod ffi;
+mod host;
+mod prompt_catalog;
+
+#[cfg(test)]
+mod tests;
+
+pub use core::{
+  capability::{llm_match_model_capabilities, llm_resolve_requested_model_match},
+  model_registry::{llm_match_model_registry, llm_resolve_model_registry_variant},
+  prompt::{
+    llm_collect_prompt_metadata, llm_count_prompt_tokens, llm_get_built_in_prompt_spec, llm_list_built_in_prompt_specs,
+    llm_render_built_in_prompt, llm_render_built_in_session_prompt, llm_render_prompt, llm_render_session_prompt,
+  },
+  request_builder::{
+    llm_build_canonical_request, llm_build_canonical_structured_request, llm_build_embedding_request,
+    llm_build_image_request_from_messages, llm_build_rerank_request, llm_infer_prompt_model_conditions,
+  },
+  structured_output::{llm_canonical_json_schema_hash, llm_validate_json_schema},
+};
+
+pub use action::run_native_action_recipe_prepared_stream;
+pub use contract_schema::{
+  llm_compile_execution_plan, llm_get_contract_schema, llm_normalize_prepared_routes, llm_validate_contract,
+};
+#[cfg(test)]
+pub(crate) use ffi::{AsyncLlmDispatchPreparedTask, resolve_request_chain};
+pub(crate) use ffi::{
+  LlmDispatchPayload, LlmEmbeddingDispatchPayload, LlmMiddlewarePayload, LlmPreparedImageDispatchRoutePayload,
+  LlmRerankDispatchPayload, LlmRoutedBackendPayload, LlmStructuredDispatchPayload, StreamPipeline,
+  apply_request_middlewares, apply_structured_request_middlewares, backend_transport_error,
+  dispatch_prepared_image_route_payloads, dispatch_prepared_structured_routes, map_backend_error, map_json_error,
+  parse_embedding_protocol, parse_prepared_chat_routes_with_middleware, parse_prepared_chat_routes_without_middleware,
+  parse_protocol, parse_rerank_protocol, parse_structured_protocol, resolve_stream_chain,
+};
+pub use ffi::{
+  llm_dispatch_prepared, llm_embedding_dispatch, llm_embedding_dispatch_prepared, llm_image_dispatch_prepared,
+  llm_plan_attachment_reference, llm_rerank_dispatch, llm_rerank_dispatch_prepared, llm_resolve_request_intent,
+  llm_structured_dispatch, llm_structured_dispatch_prepared,
+};
+pub(crate) use host::{
+  LlmStreamHandle, STREAM_ABORTED_REASON, STREAM_CALLBACK_DISPATCH_FAILED_REASON, STREAM_END_MARKER, emit_error_event,
+};
+pub use host::{
+  llm_dispatch_prepared_stream, llm_dispatch_tool_loop_stream, llm_dispatch_tool_loop_stream_prepared,
+  llm_dispatch_tool_loop_stream_routed,
+};