fix(kiro): preserve tool definitions when history contains tool calls

When conversation history includes tool usage but current request doesn't
provide tool definitions, reconstruct minimal tool specifications from
history to prevent API errors. This ensures continuity in multi-turn
conversations with tool calling.

- Extract tool names from historical tool uses
- Generate placeholder tool specs with empty schemas
- Only apply when history has tool calls but toolsContext is empty
- Remove obsolete Chinese comment

src/claude/claude-kiro.js

@@ -912,11 +912,39 @@ export class KiroApiService {
             }
             userInputMessageContext.toolResults = uniqueToolResults;
         }
+        const historyHasToolCalling = history.some(h =>
+            h.assistantResponseMessage?.toolUses ||
+            h.userInputMessage?.userInputMessageContext?.toolResults
+        );
+
         if (Object.keys(toolsContext).length > 0 && toolsContext.tools) {
             userInputMessageContext.tools = toolsContext.tools;
+        } else if (historyHasToolCalling && !toolsContext.tools) {
+            const toolNamesInHistory = new Set();
+            history.forEach(h => {
+                if (h.assistantResponseMessage?.toolUses) {
+                    h.assistantResponseMessage.toolUses.forEach(tu => {
+                        toolNamesInHistory.add(tu.name);
+                    });
+                }
+            });
+
+            if (toolNamesInHistory.size > 0) {
+                userInputMessageContext.tools = Array.from(toolNamesInHistory).map(name => ({
+                    toolSpecification: {
+                        name: name,
+                        description: "Tool",
+                        inputSchema: {
+                            json: {
+                                type: "object",
+                                properties: {}
+                            }
+                        }
+                    }
+                }));
+            }
         }
 
-        // 只有当 userInputMessageContext 有内容时才添加
         if (Object.keys(userInputMessageContext).length > 0) {
             userInputMessage.userInputMessageContext = userInputMessageContext;
         }