Update: 将子项目从 submodule 转为完整内容

- 移除 GovAI, nomifun-tauri, 算力盒子 的 submodule 引用
- 添加所有子项目的完整源代码
- 保留原始 .git 为 .git.bak 备份

GovAI/server/internal/config/constants.go

@@ -0,0 +1,54 @@
+package config
+
+import "time"
+
+// ==================== 分页与查询 ====================
+const (
+	DefaultPage     = 1
+	DefaultPageSize = 20
+	MaxPageSize     = 100
+)
+
+// ==================== Token 与会话 ====================
+const (
+	DefaultAccessTokenExpiry  = 24 * time.Hour
+	DefaultRefreshTokenExpiry = 7 * 24 * time.Hour
+	TokenHeader               = "Authorization"
+	TokenPrefix               = "Bearer "
+)
+
+// ==================== 文件上传 ====================
+const (
+	MaxFileSize           = 10 * 1024 * 1024 // 10MB
+	AllowedFileExtensions = ".pdf,.doc,.docx,.txt,.md,.jpg,.jpeg,.png,.gif,.xlsx,.xls"
+	AllowedMimeTypes      = "application/pdf,application/msword,application/vnd.openxmlformats-officedocument.wordprocessingml.document,text/plain,text/markdown,image/jpeg,image/png,image/gif,application/vnd.ms-excel,application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
+)
+
+// ==================== AI 模型 ====================
+const (
+	DefaultEmbeddingDimensions = 1024
+	DefaultEmbeddingModel      = "text-embedding-v3"
+	DefaultLLMTemperature       = 0.7
+	DefaultLLMTopP             = 0.95
+	DefaultLLMMaxTokens        = 8192
+)
+
+// ==================== RateLimit ====================
+const (
+	DefaultRateLimitMax     = 100
+	DefaultRateLimitWindow  = 1 * time.Minute
+)
+
+// ==================== Redis Key 前缀 ====================
+const (
+	RedisKeyPrefixRateLimit = "rl:"
+	RedisKeyPrefixSession   = "session:"
+	RedisKeyPrefixToken     = "token:"
+	RedisKeyPrefixCache     = "cache:"
+)
+
+// ==================== Chat ====================
+const (
+	MaxConversationHistory = 50
+	MaxMessageLength        = 4000
+)