feat(llm): 大模型双协议(OpenAI+Anthropic)接入 + SSH凭证修复 + 容量预测AI解读

后端双协议: 新增 anthropic.go(Complete/Stream/工具转换) + client.go 工厂按 Protocol 路由; llm.Client 加 Stream; llm_chat 三方法收敛复用 llm.Client; resolveProtocol 按 provider 路由; Agent CLI 注入协议。编码套餐(GLM-5.2/Kimi/MiMo/Anthropic)走 Anthropic /v1/messages。

SSH凭证修复: applyCredential 正确解析凭证 JSON 的 private_key(旧实现把整个 JSON 当私钥 → ssh.ParsePrivateKey 失败 → ssh-key 登录不通); AssignCredential/批量导入/单台 CRUD 三处统一; 单台补齐 credential_id 字段(原被忽略)。

容量预测: 新增 AI 深度解读(buildCapacityInsightPrompt + PredictiveCapacityTab 按钮, 复用 aiApi.chat)。

其他: DeepSeek 模型名更新为 deepseek-v4-flash/pro; 智能助手去掉重复模型配置按钮; LLMConfig 精简生成参数(Claude Code 式)。

Co-Authored-By: Claude <noreply@anthropic.com>

backend/controller/server.go

@@ -223,6 +223,21 @@ func (h *ServerHandler) CreateServer(c *gin.Context) {
 		server.AuthType = "password"
 	}
 
+	// 关联 SSH 凭证：解密后覆盖认证字段（同 AssignCredential，避免单台 CRUD 忽略 credential_id） // Logan.Li
+	if req.CredentialID != nil && *req.CredentialID > 0 {
+		var cred model.Credential
+		if err := h.db.First(&cred, *req.CredentialID).Error; err != nil {
+			c.JSON(http.StatusBadRequest, model.Response{Code: 400, Message: "凭据不存在"})
+			return
+		}
+		plain, err := h.crypt.Decrypt(cred.Content)
+		if err != nil {
+			c.JSON(http.StatusInternalServerError, model.Response{Code: 500, Message: "凭据解密失败"})
+			return
+		}
+		applyCredential(cred, plain, &server)
+	}
+
 	if err := h.db.Create(&server).Error; err != nil {
 		c.JSON(http.StatusInternalServerError, model.Response{
 			Code:    500,
@@ -297,6 +312,25 @@ func (h *ServerHandler) UpdateServer(c *gin.Context) {
 	if req.AuthType != "" {
 		updates["auth_type"] = req.AuthType
 	}
+	// 关联 SSH 凭证：解密后覆盖认证字段（applyCredential 填充已 load 的 server，再同步到 updates） // Logan.Li
+	if req.CredentialID != nil && *req.CredentialID > 0 {
+		var cred model.Credential
+		if err := h.db.First(&cred, *req.CredentialID).Error; err != nil {
+			c.JSON(http.StatusBadRequest, model.Response{Code: 400, Message: "凭据不存在"})
+			return
+		}
+		plain, err := h.crypt.Decrypt(cred.Content)
+		if err != nil {
+			c.JSON(http.StatusInternalServerError, model.Response{Code: 500, Message: "凭据解密失败"})
+			return
+		}
+		applyCredential(cred, plain, &server)
+		updates["ssh_key"] = server.SSHKey
+		updates["password"] = server.Password
+		updates["auth_type"] = server.AuthType
+		updates["username"] = server.Username
+		updates["port"] = server.Port
+	}
 	if req.OS != "" {
 		updates["os"] = req.OS
 	}