chore: init uv project with Python 3.11 and backend deps

.python-version

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+3.11

pyproject.toml

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+[project]
+name = "ai-interviewmentor"
+version = "0.1.0"
+description = "Add your description here"
+readme = "README.md"
+requires-python = ">=3.11"
+dependencies = [
+    "asyncpg==0.29.0",
+    "bcrypt==4.1.3",
+    "fastapi==0.115.0",
+    "httpx==0.27.2",
+    "langgraph==0.2.50",
+    "langgraph-checkpoint-postgres==2.0.8",
+    "pydantic==2.8.2",
+    "python-dotenv==1.0.1",
+    "python-jose[cryptography]==3.3.0",
+    "python-multipart==0.0.9",
+    "uvicorn==0.30.6",
+]