fix: 对照 API 文档修复 3 个 Adapter 的 8 个实现差异

通过逐接口对比 DeepSeek/AgnesAI/Ollama 官方文档与实现代码，发现并修复：

DeepSeek (4 fix):
- temperature 默认值: 错误发送 0(API默认=1)，改为 undefined 让 API 用默认值
- thinking 禁用: API 默认 enabled，不传=开启。改为显式发送 {type:disabled}
- reasoning_effort: 补充 xhigh→max 映射(文档规定)
- stream 请求: 补充 AbortSignal.timeout 超时控制

Agnes AI (2 fix):
- temperature 默认值: 同上
- 图片 image_url: 移除文档未提及的 detail 字段

Ollama (3 fix):
- temperature 默认值: 同上(Ollama默认≈0.8)
- tool_calls arguments: 从对象改为 JSON 字符串(REST API 要求)
- finishReason: 使用 done_reason 字段正确映射(之前始终返回 STOP)

electron/harness/adapters/ollama.adapter.ts

@@ -370,10 +370,10 @@ export class OllamaAdapter extends BaseAdapter {
             ? m.toolResult.result
             : JSON.stringify(m.toolResult.result);
         }
-        // assistant 工具调用
+        // assistant 工具调用（Ollama REST API 要求 arguments 为 JSON 字符串）
         if (m.role === 'assistant' && m.toolCalls?.length) {
           msg.tool_calls = m.toolCalls.map((tc) => ({
-            function: { name: tc.name, arguments: tc.args },
+            function: { name: tc.name, arguments: JSON.stringify(tc.args) },
           }));
         }
         return msg;
@@ -384,7 +384,7 @@ export class OllamaAdapter extends BaseAdapter {
       model: this.config.defaultModel,
       messages,
       options: {
-        temperature: request.params.temperature ?? 0,
+        temperature: request.params.temperature,
         num_predict: request.params.maxTokens,
         top_p: request.params.topP,
         stop: request.params.stopSequences,
@@ -448,7 +448,26 @@ export class OllamaAdapter extends BaseAdapter {
         outputTokens: (data.eval_count as number) ?? 0,
         totalTokens: ((data.prompt_eval_count as number) ?? 0) + ((data.eval_count as number) ?? 0),
       },
-      finishReason: data.done ? MetonaFinishReason.STOP : MetonaFinishReason.LENGTH,
+      finishReason: mapOllamaDoneReason(data.done_reason as string | undefined, !!message?.tool_calls),
     };
   }
 }
+
+/**
+ * 映射 Ollama done_reason → MetonaFinishReason
+ *
+ * @see apis/ollama-api-docs-20260518.html — /api/chat 响应字段
+ */
+function mapOllamaDoneReason(
+  reason: string | undefined,
+  hasToolCalls: boolean,
+): MetonaFinishReason {
+  if (hasToolCalls) return MetonaFinishReason.TOOL_CALLS;
+  switch (reason) {
+    case 'stop': return MetonaFinishReason.STOP;
+    case 'length': return MetonaFinishReason.LENGTH;
+    case 'load': return MetonaFinishReason.ERROR;
+    case 'unload': return MetonaFinishReason.ERROR;
+    default: return MetonaFinishReason.STOP;
+  }
+}