Reorganize into monorepo layout, move mitarbeiter-app to legacy reference

Consolidates the previously separate omsorgapp and omsorgCore repos
(each had their own nested .git with GitHub history) plus the old
root-level website/mitarbeiter-app into a single monorepo, matching
the structure already documented in the root CLAUDE.md. Also moves
the PHP employee app aside as omsorgWeb/mitarbeiter-app-legacy/ to
serve as a template for a ground-up rewrite.

Fixes .gitignore in the same pass: the config-secrets/uploads/data
patterns were unanchored (relative to repo root, not depth-agnostic),
so they silently stopped matching once the app moved under omsorgWeb/.
Patterns are now **/-prefixed and cover both mitarbeiter-app and
mitarbeiter-app-legacy, keeping DB/SMTP credentials and uploaded
employee documents out of version control.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

omsorgapp/README.md

@@ -0,0 +1,24 @@
+# Omsorg Business Controls Pro – Release 0.1.1 Foundation
+
+Stabile lokale Electron/React-Basis ohne native SQLite-Abhängigkeit.
+
+## Warum 0.1.1?
+Release 0.1.0 nutzte `better-sqlite3`. Auf macOS/Electron kann dieses native Modul Versionsprobleme verursachen.
+Release 0.1.1 speichert Daten zuerst in einer lokalen JSON-Datenbank im Benutzerordner.
+
+## Start
+```bash
+cd ~/Desktop/omsorg-business-controls-pro-release-0.1.1
+npm install
+npm run dev
+```
+
+## Lokale Daten
+Die App legt Ordner unter `~/Documents/Omsorg Business Controls Pro` an:
+- database/omsorg-local-db.json
+- documents/employees
+- documents/customers
+- backups
+
+## Nächster Sprint
+SQLite wird später sauber über eine entkoppelte Persistenzschicht eingebaut.