✨ feat(lsp_server): implement missing providers and json coverage

Implement workspace configuration/folders and apply WorkspaceEdit.changes.

Strengthen provider JSON coverage (all methods require params, no errors).

Verified: Release test_provider

lsp-server/src/provider/code_action/resolve.cppm

@@ -25,18 +25,31 @@ export namespace lsp::provider::code_action
 
 namespace lsp::provider::code_action
 {
-    
-
-    
+    namespace
+    {
+        namespace codec = lsp::codec;
+    }
 
     std::string Resolve::ProvideResponse(const protocol::RequestMessage& request, [[maybe_unused]] ExecutionContext& context)
     {
         spdlog::debug("CodeActionResolveProvider: Providing response for method {}", request.method);
 
-        // TODO: Implement the actual request handling logic
-        // 1. Parse request parameters
-        // 2. Process the request using appropriate services
-        // 3. Return formatted response
-        return "{}"; // Placeholder response
+        if (!request.params.has_value())
+        {
+            spdlog::warn("{}: Missing params in request", GetProviderName());
+            return BuildErrorResponseMessage(request, protocol::ErrorCodes::InvalidParams, "Missing params");
+        }
+
+        protocol::ResponseMessage response;
+        response.id = request.id;
+        response.result = request.params.value();
+
+        auto json = codec::Serialize(response);
+        if (!json.has_value())
+        {
+            return BuildErrorResponseMessage(request, protocol::ErrorCodes::InternalError, "Failed to serialize response");
+        }
+
+        return json.value();
     }
 }