Refactor data handlers + misc fixes

This refactors the data handlers into a more standard/understood model-like architecture, to prepare for a new, more robust config system.

It also fixes a problem with creating new Notes and uploading new Photos via the web interface (related to #58).

Finally, it speeds up docker builds by sending in less files, which aren't necessary or will be built anyway.

This is all in preparation to allow building #13 more robustly.

routes/api/files/get.tsx

@@ -1,7 +1,7 @@
 import { Handlers } from 'fresh/server.ts';
 
 import { DirectoryFile, FreshContextState } from '/lib/types.ts';
-import { getFiles } from '/lib/data/files.ts';
+import { FileModel } from '/lib/models/files.ts';
 
 interface Data {}
 
@@ -28,7 +28,7 @@ export const handler: Handlers<Data, FreshContextState> = {
       return new Response('Bad Request', { status: 400 });
     }
 
-    const files = await getFiles(
+    const files = await FileModel.list(
       context.state.user.id,
       requestBody.parentPath,
     );