Add: add base fastapi backend

backend/pyproject.toml

@@ -0,0 +1,62 @@
+[project]
+name = "backend"
+version = "0.1.0"
+description = ""
+readme = "README.md"
+requires-python = ">=3.13,<3.14"
+dependencies = [
+    "alembic>=1.17.2",
+    "asyncpg>=0.30.0",
+    "fastapi>=0.121.2",
+    "pydantic>=2.12.4",
+    "pydantic-settings>=2.12.0",
+    "sqlalchemy>=2.0.44",
+    "unicorn>=2.1.4",
+    "uvicorn>=0.38.0",
+]
+
+[dependency-groups]
+dev = [
+    "pyrefly>=0.37.0",
+    "ruff>=0.14.0",
+]
+
+[tool.ruff]
+target-version = "py313"
+line-length = 70
+indent-width = 4
+exclude = [
+    ".git/",
+    "venv/",
+    ".venv/",
+    "vscode/",
+    "__pycache__/",
+    ".ruff_cache/",
+]
+
+
+[tool.ruff.lint]
+dummy-variable-rgx = "^(_+|(_+[a-zA-Z0-9_]*[a-zA-Z0-9]+?))$"
+select = ["E", "F", "N", "I", "C90", "T", "S"]
+ignore = []
+fixable = ["ALL"]
+unfixable = []
+
+[tool.ruff.format]
+quote-style = "double"
+indent-style = "space"
+skip-magic-trailing-comma = false
+line-ending = "auto"
+
+[tool.pyrefly]
+project-includes = ["**/*"]
+python-platform = "linux"
+python-version = "3.13"
+infer-with-first-use = true
+use-ignore-files = true
+project-excludes = [
+    "**/node_modules",
+    "**/__pycache__",
+    "**/.ruff_cache",
+    "**/*venv/**/*",
+]