Add full project structure: backend, frontend, Docker, and CI workflows

- Organize backend into src/ (routes/, services/, db/) per package.json entrypoint
- Add migrations/import-mdb.js for one-time .mdb → SQLite migration
- Add public/ frontend: check ledger table, slide-in new/edit panel, PDF generation
- Add docker/Dockerfile and docker-compose.yml for self-hosted deployment
- Add .github/workflows: Docker Hub build+push on main/tags, TODO→Issues scanner
- Add GnuMICR font files (GPL-2.0) for MICR E-13B line rendering

fonts/NEWS

@@ -0,0 +1,15 @@
+Feb 2, 2004
+  Hm, this version 0.30 has been sitting around for a while, put it out
+  there!  Several people have reported using this font with good success,
+  even in commercial applications.
+
+August 12, 2000
+  I have someone who is willing to test the TTF version of this font in
+  the real world, on a fairly large scale... we'll see how it goes!
+
+  The TTF version was just converted by a font program, so I have no
+  idea if conversion errors were introduced.
+
+July 1, 2000
+  First Public Release
+