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/credential_assign.go

@@ -1,6 +1,7 @@
 package controller
 
 import (
+	"encoding/json"
 	"net/http"
 	"strconv"
 
@@ -43,15 +44,7 @@ func (h *CredentialHandler) AssignCredential(c *gin.Context) {
 		return
 	}
 
-	if cred.SecretType == "ssh" {
-		server.SSHKey = plain
-		server.AuthType = "key"
-		server.Password = ""
-	} else {
-		server.Password = plain
-		server.AuthType = "password"
-		server.SSHKey = ""
-	}
+	applyCredential(cred, plain, &server)
 
 	if err := h.db.Save(&server).Error; err != nil {
 		c.JSON(http.StatusInternalServerError, model.Response{Code: 500, Message: "分配失败: " + err.Error()})
@@ -60,3 +53,30 @@ func (h *CredentialHandler) AssignCredential(c *gin.Context) {
 
 	c.JSON(http.StatusOK, model.Response{Code: 200, Message: "凭据已关联"})
 }
+
+// applyCredential 将解密后的明文 plain 填充到 server 认证字段（统一入口，避免 plain JSON 误用） // Logan.Li
+// ssh 凭证 plain 是 JSON {"private_key":...,"ssh_user":...,"ssh_port":...}，须解析出 private_key（旧实现直接把
+// 整个 JSON 当私钥，导致 ssh.ParsePrivateKey 失败 → ssh-key 登录不通）；其余类型 plain 即密码。
+// 供 AssignCredential / 单台服务器 CRUD / 批量导入 三处复用。
+func applyCredential(cred model.Credential, plain string, server *model.Server) {
+	if cred.SecretType == "ssh" {
+		privateKey := plain
+		var sshc model.SSHSecretContent
+		if json.Unmarshal([]byte(plain), &sshc) == nil && sshc.PrivateKey != "" {
+			privateKey = sshc.PrivateKey
+			if sshc.SSHUser != "" {
+				server.Username = sshc.SSHUser
+			}
+			if sshc.SSHPort > 0 {
+				server.Port = sshc.SSHPort
+			}
+		}
+		server.SSHKey = privateKey
+		server.AuthType = "key"
+		server.Password = ""
+	} else {
+		server.Password = plain
+		server.AuthType = "password"
+		server.SSHKey = ""
+	}
+}