refactor(structure): reorganize app layout

BREAKING CHANGE: root backend/frontend directories and old run/manage entrypoints were removed. Use apps/backend, apps/frontend, and python main.py commands instead.

apps/backend/requirements.txt

@@ -0,0 +1,27 @@
+# Web Framework
+fastapi>=0.115.12
+uvicorn[standard]>=0.34.0
+
+# Database
+sqlalchemy>=2.0.36
+
+# Validation & Settings
+pydantic[email]>=2.10.6
+pydantic-settings>=2.7.1
+python-dotenv>=1.0.1
+
+# Authentication & Security
+pyjwt>=2.10.1
+bcrypt>=4.2.2
+slowapi>=0.1.9
+
+# Task Scheduling
+apscheduler>=3.10.4
+croniter>=5.0.3
+
+# Automation
+selenium>=4.28.1
+filelock>=3.16.1
+
+# HTTP & Utilities
+requests>=2.32.3