feat: Library 批量注册 + PeopleView 修复 + 国际化

Library:
- 添加 checkbox 和鼠标框选功能
- Unregistered 卡片添加快速注册按钮
- 状态标签移至左下方，人脸图标移至左侧中间
- Deep Scan 改为 unregister -> register -> process
- 完整国际化（日语、繁体中文、英语）

PeopleView:
- 修复卡片不显示问题（使用 get_file_traces API）
- 移除对 identity_id 字段的依赖

其他:
- 添加日语语言包
- 添加 useDragSelect composable
- 新增文档：Face Bbox Null Bug Report

src-tauri/src/db.rs

@@ -24,6 +24,16 @@ CREATE TABLE IF NOT EXISTS bookmarks (
     created_at TEXT DEFAULT (datetime('now'))
 );
 
+CREATE TABLE IF NOT EXISTS video_marks (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    file_uuid TEXT NOT NULL,
+    tag TEXT NOT NULL,
+    start_frame INTEGER NOT NULL,
+    end_frame INTEGER,
+    note TEXT,
+    created_at TEXT DEFAULT (datetime('now'))
+);
+
 CREATE TABLE IF NOT EXISTS app_users (
     id TEXT PRIMARY KEY,
     username TEXT NOT NULL UNIQUE,
@@ -36,6 +46,7 @@ CREATE TABLE IF NOT EXISTS app_users (
 
 CREATE INDEX IF NOT EXISTS idx_search_history_sort ON search_history(pinned DESC, updated_at DESC);
 CREATE INDEX IF NOT EXISTS idx_bookmarks_created ON bookmarks(created_at DESC);
+CREATE INDEX IF NOT EXISTS idx_video_marks_file ON video_marks(file_uuid);
 ";
 
 static DB_CONN: Mutex<Option<Connection>> = Mutex::new(None);
@@ -281,6 +292,75 @@ pub fn delete_bookmark(id: i64) -> Result<(), String> {
     Ok(())
 }
 
+#[derive(Debug, Serialize, Deserialize, Clone)]
+pub struct VideoMark {
+    pub id: i64,
+    pub file_uuid: String,
+    pub tag: String,
+    pub start_frame: i64,
+    pub end_frame: Option<i64>,
+    pub note: Option<String>,
+    pub created_at: Option<String>,
+}
+
+#[tauri::command(rename_all = "camelCase")]
+pub fn get_video_marks(file_uuid: String) -> Result<Vec<VideoMark>, String> {
+    let conn = get_conn()?;
+    let mut stmt = conn
+        .prepare("SELECT id, file_uuid, tag, start_frame, end_frame, note, created_at FROM video_marks WHERE file_uuid = ?1 ORDER BY start_frame ASC")
+        .map_err(|e| format!("Prepare error: {}", e))?;
+    let items = stmt
+        .query_map([file_uuid], |row| {
+            Ok(VideoMark {
+                id: row.get(0)?,
+                file_uuid: row.get(1)?,
+                tag: row.get(2)?,
+                start_frame: row.get(3)?,
+                end_frame: row.get(4)?,
+                note: row.get(5)?,
+                created_at: row.get(6)?,
+            })
+        })
+        .map_err(|e| format!("Query error: {}", e))?
+        .filter_map(|r| r.ok())
+        .collect();
+    Ok(items)
+}
+
+#[tauri::command(rename_all = "camelCase")]
+pub fn save_video_mark(
+    file_uuid: String,
+    tag: String,
+    start_frame: i64,
+    end_frame: Option<i64>,
+    note: Option<String>,
+) -> Result<VideoMark, String> {
+    let conn = get_conn()?;
+    conn.execute(
+        "INSERT INTO video_marks (file_uuid, tag, start_frame, end_frame, note) VALUES (?1, ?2, ?3, ?4, ?5)",
+        rusqlite::params![file_uuid, tag, start_frame, end_frame, note],
+    )
+    .map_err(|e| format!("Insert error: {}", e))?;
+    let id = conn.last_insert_rowid();
+    Ok(VideoMark {
+        id,
+        file_uuid,
+        tag,
+        start_frame,
+        end_frame,
+        note,
+        created_at: None,
+    })
+}
+
+#[tauri::command(rename_all = "camelCase")]
+pub fn delete_video_mark(id: i64) -> Result<(), String> {
+    let conn = get_conn()?;
+    conn.execute("DELETE FROM video_marks WHERE id = ?1", [id])
+        .map_err(|e| format!("Delete error: {}", e))?;
+    Ok(())
+}
+
 pub fn verify_user(username: &str, password: &str) -> Result<Option<User>, String> {
     let conn = get_conn()?;
     let mut stmt = conn