feat: 从服务器导入文件（引用模式）

backend/src/db.rs

@@ -77,6 +77,14 @@ fn ensure_workspace_schema_and_backfill(conn: &duckdb::Connection) {
         "CREATE INDEX IF NOT EXISTS idx_files_workspace ON files(workspace_id)",
         [],
     );
+    let _ = conn.execute(
+        "ALTER TABLE files ADD COLUMN source_type VARCHAR DEFAULT 'upload'",
+        [],
+    );
+    let _ = conn.execute(
+        "CREATE INDEX IF NOT EXISTS idx_files_source_type ON files(source_type)",
+        [],
+    );
 
     recover_detached_workspace_members(conn).expect("Failed to recover detached workspace members");
     backfill_workspace_data(conn).expect("Failed to backfill workspace data");

backend/src/handlers.rs

@@ -56,7 +56,7 @@ pub type TileFileMetadata = (
     Option<String>,
 );
 
-async fn get_workspace_id(
+pub async fn get_workspace_id(
     auth_session: &AuthSession<crate::AuthBackend>,
     state: &AppState,
 ) -> Result<String, (StatusCode, Json<ErrorResponse>)> {

backend/src/lib.rs

@@ -15,6 +15,7 @@ mod password;
 mod postgis;
 mod public;
 mod routes;
+mod server_files_handlers;
 mod session_store;
 mod static_assets;
 mod test_routes;

backend/src/routes.rs

@@ -20,6 +20,7 @@ use crate::{
     },
     postgis::{register_postgis_source, test_postgis_connection},
     public::{get_public_pmtiles, get_public_tile, get_public_tile_meta, head_public_pmtiles},
+    server_files_handlers::{browse_directory, import_files, list_directories},
     upload::upload_file,
     workspace_handlers::{
         create_workspace, delete_workspace, get_current_workspace, get_workspace, invite_member,
@@ -137,7 +138,11 @@ fn build_api_router_with_auth(state: AppState, with_auth: bool) -> Router {
         .route(
             "/api/workspaces/{id}/members/{user_id}",
             delete(remove_member),
-        );
+        )
+        // Server file import routes
+        .route("/api/server-files/directories", get(list_directories))
+        .route("/api/server-files/browse", get(browse_directory))
+        .route("/api/server-files/import", post(import_files));
 
     if with_auth {
         api_router = api_router.route_layer(axum_login::login_required!(crate::AuthBackend));