feat: AI 意图路由/草稿存储 + Prompts 模块化 + UI 视觉统一 + AI 同意门 + 资源更新

后端:
- 新增 ai_intent_router 意图路由
- 新增 AiEntryDraft 草稿存储 + EF 迁移
- 新增 Prompts 模块化（global/modules/rag/router）
- AI Agent handlers 扩展

前端:
- 新增 AI 同意门 (ai_consent_gate/provider/details_page)
- HealthMetricVisuals 视觉统一
- 设备扫描/管理页面优化
- agent 插图替换 + 趋势指标图标

配置:
- DeepSeek 模型改 deepseek-v4-flash
- .gitignore 加 artifacts/audit
- build.gradle.kts 签名配置调整

backend/src/Health.Infrastructure/AI/ai_clients.cs

@@ -9,7 +9,7 @@ namespace Health.Infrastructure.AI;
 public sealed class DeepSeekClient(HttpClient http, IConfiguration config)
 {
     private readonly HttpClient _http = http;
-    private readonly string _model = config["DEEPSEEK_MODEL"] ?? "deepseek-chat";
+    private readonly string _model = config["DEEPSEEK_MODEL"] ?? "deepseek-v4-flash";
     private readonly JsonSerializerOptions _jsonOptions = new()
     {
         PropertyNamingPolicy = JsonNamingPolicy.SnakeCaseLower,
@@ -28,8 +28,13 @@ public sealed class DeepSeekClient(HttpClient http, IConfiguration config)
     {
         var request = new ChatCompletionRequest
         {
-            Model = _model, Messages = messages, Stream = true,
-            MaxTokens = maxTokens, Temperature = temperature, Tools = tools,
+            Model = _model,
+            Messages = messages,
+            Stream = true,
+            MaxTokens = maxTokens,
+            Temperature = temperature,
+            Tools = tools,
+            Thinking = new { type = "disabled" },
         };
         if (tools?.Count > 0) request.ToolChoice = "auto";
 
@@ -64,14 +69,20 @@ public sealed class DeepSeekClient(HttpClient http, IConfiguration config)
         List<ToolDefinition>? tools = null,
         int maxTokens = 2048,
         float temperature = 0.7f,
+        string? toolChoice = null,
         CancellationToken ct = default)
     {
         var request = new ChatCompletionRequest
         {
-            Model = _model, Messages = messages, Stream = false,
-            MaxTokens = maxTokens, Temperature = temperature, Tools = tools,
+            Model = _model,
+            Messages = messages,
+            Stream = false,
+            MaxTokens = maxTokens,
+            Temperature = temperature,
+            Tools = tools,
+            Thinking = new { type = "disabled" },
         };
-        if (tools?.Count > 0) request.ToolChoice = "auto";
+        if (tools?.Count > 0) request.ToolChoice = toolChoice ?? "auto";
 
         var json = JsonSerializer.Serialize(request, _jsonOptions);
         var content = new StringContent(json, Encoding.UTF8, "application/json");
@@ -117,8 +128,12 @@ public sealed class VisionClient(HttpClient http, IConfiguration config)
 
         var request = new ChatCompletionRequest
         {
-            Model = _model, Messages = messages, MaxTokens = maxTokens, Stream = false,
-            Temperature = 0.1f, VlHighResolutionImages = true,
+            Model = _model,
+            Messages = messages,
+            MaxTokens = maxTokens,
+            Stream = false,
+            Temperature = 0.1f,
+            VlHighResolutionImages = true,
             EnableThinking = false,
         };