feat: dockerize app and convert to pyproject setup

- Add pyproject.toml with proper metadata and dependency groups
- Create multi-stage Dockerfile for backend
- Add docker-compose.yml with dev/prod profiles
- Create frontend Dockerfile with nginx
- Add .dockerignore for optimized builds
- Update README with Docker instructions and troubleshooting
- Remove requirements.txt in favor of pyproject.toml
- Ensure data persistence with Docker volumes

backend/pyproject.toml

@@ -0,0 +1,68 @@
+[build-system]
+requires = ["setuptools>=61.0", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "backup-tool"
+version = "0.1.0"
+description = "Web-based backup management tool for small teams and SMBs"
+readme = "README.md"
+license = {text = "MIT"}
+requires-python = ">=3.11"
+authors = [
+    {name = "Backup Tool Team"}
+]
+keywords = ["backup", "restore", "scheduler", "web"]
+classifiers = [
+    "Development Status :: 4 - Beta",
+    "Intended Audience :: System Administrators",
+    "License :: OSI Approved :: MIT License",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
+    "Topic :: System :: Archiving :: Backup",
+]
+dependencies = [
+    "fastapi>=0.115.0",
+    "uvicorn[standard]>=0.34.0",
+    "sqlalchemy[asyncio]>=2.0.0",
+    "aiosqlite>=0.21.0",
+    "alembic>=1.15.0",
+    "pydantic>=2.13.0",
+    "pydantic-settings>=2.9.0",
+    "apscheduler>=3.11.0",
+    "paramiko>=3.5.0",
+    "aiofiles>=23.2.0",
+    "httpx>=0.28.0",
+]
+
+[project.optional-dependencies]
+dev = [
+    "pytest>=8.3.0",
+    "pytest-asyncio>=0.26.0",
+]
+prod = [
+    "gunicorn>=23.0.0",
+]
+
+[project.scripts]
+backup-tool = "app.main:main"
+
+[project.urls]
+Homepage = "https://github.com/backup-tool/backup-tool"
+Documentation = "https://github.com/backup-tool/backup-tool#readme"
+Repository = "https://github.com/backup-tool/backup-tool.git"
+
+[tool.setuptools.packages.find]
+where = ["."]
+include = ["app*", "backup*", "alembic*"]
+
+[tool.pytest.ini_options]
+asyncio_mode = "auto"
+testpaths = ["tests"]
+pythonpath = [".", "app", "backup"]
+
+[tool.setuptools.package-data]
+alembic = ["*.ini", "*.py", "*.mako"]