MarkBase架构升级：Multi-Volume Virtual Tree + Dual-View Management + Git Remote修正

核心功能：
- ✅ Categories/Series双视图管理（category_view.rs + import_markdown.rs）
- ✅ FUSE Multi-Volume支持（tree_type参数）
- ✅ SSH/SFTP/SCP/rsync协议完整实现（4042行）
- ✅ NFS/SMB Module Phase 1-3完成
- ✅ Archive Module Phase 1-4完成（2916行）
- ✅ Download Center API完整实现
- ✅ S3兼容API实现（560行）

Git配置修正：
- ✅ 删除错误origin（gitea.momentry.ddns.net）
- ✅ 删除m5max128（指向机器名）
- ✅ 设置origin = m5max128gitea.momentry.ddns.net/admin/markbase
- ✅ 设置m4minigitea = m4minigitea.momentry.ddns.net/warren/markbase

数据清理：
- ✅ 删除38个临时SQLite（保留accusys.sqlite、demo.sqlite）
- ✅ 删除.bak、test_*.bin、调试脚本等临时文件
- ✅ 删除临时目录（build/、download files/、raid_test/等）
- ✅ 更新.gitignore排除临时文件

架构优化：
- 52个文件修改，2434行新增，4739行删除
- Workspace成员整合（16个crate）
- 数据库状态：accusys.sqlite保留（主demo测试）

远程同步：
- ✅ 准备推送到m5max128gitea（远程Gitea）
- ✅ 准备推送到m4minigitea（本地Gitea）

MarkBaseFS/MarkBaseFSApp/Sources/DatabaseConfig.swift

@@ -0,0 +1,99 @@
+import Foundation
+import SQLite3
+
+class DatabaseConfig {
+    private var currentDatabasePath: String = "/Users/accusys/markbase/data/users/warren.sqlite"
+    
+    func getCurrentDatabasePath() -> String {
+        return currentDatabasePath
+    }
+    
+    func setDatabasePath(_ path: String) {
+        currentDatabasePath = path
+    }
+    
+    func validateDatabase(path: String) -> Bool {
+        let fileManager = FileManager.default
+        
+        if !fileManager.fileExists(atPath: path) {
+            print("Database file not found: \(path)")
+            return false
+        }
+        
+        var db: OpaquePointer?
+        let result = sqlite3_open(path, &db)
+        
+        if result != SQLITE_OK {
+            print("Failed to open database: \(path)")
+            return false
+        }
+        
+        var statement: OpaquePointer?
+        let query = "SELECT name FROM sqlite_master WHERE type='table' AND name='file_nodes'"
+        
+        if sqlite3_prepare_v2(db, query, -1, &statement, nil) == SQLITE_OK {
+            if sqlite3_step(statement) == SQLITE_ROW {
+                sqlite3_finalize(statement)
+                sqlite3_close(db)
+                print("Database validated: \(path)")
+                return true
+            }
+        }
+        
+        sqlite3_finalize(statement)
+        sqlite3_close(db)
+        print("Database validation failed: file_nodes table not found")
+        return false
+    }
+    
+    func getNodeCount() -> Int {
+        var db: OpaquePointer?
+        let result = sqlite3_open(currentDatabasePath, &db)
+        
+        if result != SQLITE_OK {
+            print("Failed to open database for node count")
+            return 0
+        }
+        
+        var statement: OpaquePointer?
+        let query = "SELECT COUNT(*) FROM file_nodes"
+        
+        var count: Int = 0
+        
+        if sqlite3_prepare_v2(db, query, -1, &statement, nil) == SQLITE_OK {
+            if sqlite3_step(statement) == SQLITE_ROW {
+                count = Int(sqlite3_column_int64(statement, 0))
+            }
+        }
+        
+        sqlite3_finalize(statement)
+        sqlite3_close(db)
+        
+        return count
+    }
+    
+    func checkIntegrity() -> Bool {
+        var db: OpaquePointer?
+        let result = sqlite3_open(currentDatabasePath, &db)
+        
+        if result != SQLITE_OK {
+            return false
+        }
+        
+        var statement: OpaquePointer?
+        let query = "PRAGMA integrity_check"
+        
+        if sqlite3_prepare_v2(db, query, -1, &statement, nil) == SQLITE_OK {
+            if sqlite3_step(statement) == SQLITE_ROW {
+                let text = String(cString: sqlite3_column_text(statement, 0))
+                sqlite3_finalize(statement)
+                sqlite3_close(db)
+                return text == "ok"
+            }
+        }
+        
+        sqlite3_finalize(statement)
+        sqlite3_close(db)
+        return false
+    }
+}