build: Add DevContainer and Docker configuration

Set up VS Code DevContainer support with Python 3.13 and development tooling for consistent development environment across machines.

DevContainer features:
- Python 3.13 official devcontainer image
- Automatic Poetry installation and dependency setup
- Port forwarding for FastAPI (8000)
- VS Code extensions pre-installed:
  * Python extension pack
  * Pylance (language server)
  * Ruff (linting/formatting)
  * mypy type checker

Editor configuration:
- Auto-format on save with Ruff
- Organize imports on save
- Enable all code actions
- Consistent Python interpreter path

Docker Compose:
- Simplified configuration (removed PostgreSQL)
- Python 3.13 base image
- Volume mount for live code updates
- Isolated network for future scalability
- Sleep infinity for container persistence

Benefits:
- Zero-config setup for new developers
- Consistent tooling across team
- Isolated dependencies
- Pre-configured linting and formatting
- Works on any platform (Windows, Mac, Linux)

Usage:
1. Open in VS Code
2. Install Dev Containers extension
3. Reopen in Container (F1 → "Dev Containers: Reopen in Container")
4. Everything installs automatically

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: cguarinosu

.devcontainer/devcontainer.json

@@ -0,0 +1,70 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/docker-existing-docker-compose
+{
+	"name": "FastAPI Todo App",
+
+	// Update the 'dockerComposeFile' list if you have more compose files or use different names.
+	// The .devcontainer/docker-compose.yml file contains any overrides you need/want to make.
+	"dockerComposeFile": [
+		"../docker-compose.yml",
+		"docker-compose.yml"
+	],
+
+	// The 'service' property is the name of the service for the container that VS Code should
+	// use. Update this value and .devcontainer/docker-compose.yml to the real service name.
+	"service": "app",
+
+	// The optional 'workspaceFolder' property is the path VS Code should open by default when
+	// connected. This is typically a file mount in .devcontainer/docker-compose.yml
+	"workspaceFolder": "/workspaces/${localWorkspaceFolderBasename}",
+
+	// Features to add to the dev container. More info: https://containers.dev/features.
+	"features": {
+		"ghcr.io/devcontainers/features/python:1": {
+			"version": "3.13",
+			"installTools": true
+		}
+	},
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	"forwardPorts": [8000],
+
+	// Uncomment the next line if you want start specific services in your Docker Compose config.
+	// "runServices": [],
+
+	// Uncomment the next line if you want to keep your containers running after VS Code shuts down.
+	// "shutdownAction": "none",
+
+	// Install dependencies after container is created
+	"postCreateCommand": "pip install poetry && poetry install",
+
+	// Configure tool-specific properties.
+	"customizations": {
+		"vscode": {
+			"extensions": [
+				"ms-python.python",
+				"ms-python.vscode-pylance",
+				"charliermarsh.ruff",
+				"ms-python.mypy-type-checker"
+			],
+			"settings": {
+				"python.defaultInterpreterPath": "/usr/local/bin/python",
+				"python.linting.enabled": true,
+				"python.formatting.provider": "none",
+				"[python]": {
+					"editor.defaultFormatter": "charliermarsh.ruff",
+					"editor.formatOnSave": true,
+					"editor.codeActionsOnSave": {
+						"source.fixAll": "explicit",
+						"source.organizeImports": "explicit"
+					}
+				},
+				"ruff.enable": true,
+				"mypy-type-checker.importStrategy": "fromEnvironment"
+			}
+		}
+	}
+
+	// Uncomment to connect as an existing user other than the container default. More info: https://aka.ms/dev-containers-non-root.
+	// "remoteUser": "devcontainer"
+}

.devcontainer/docker-compose.yml

@@ -0,0 +1,26 @@
+version: '3.8'
+services:
+  # Update this to the name of the service you want to work with in your docker-compose.yml file
+  app:
+    # Uncomment if you want to override the service's Dockerfile to one in the .devcontainer 
+    # folder. Note that the path of the Dockerfile and context is relative to the *primary* 
+    # docker-compose.yml file (the first in the devcontainer.json "dockerComposeFile"
+    # array). The sample below assumes your primary file is in the root of your project.
+    #
+    # build:
+    #   context: .
+    #   dockerfile: .devcontainer/Dockerfile
+
+    volumes:
+      # Update this to wherever you want VS Code to mount the folder of your project
+      - ..:/workspaces:cached
+
+    # Uncomment the next four lines if you will use a ptrace-based debugger like C++, Go, and Rust.
+    # cap_add:
+    #   - SYS_PTRACE
+    # security_opt:
+    #   - seccomp:unconfined
+
+    # Overrides default command so things don't shut down after the process ends.
+    command: sleep infinity
+ 

docker-compose.yml

@@ -0,0 +1,16 @@
+version: '3.8'
+services:
+  app:
+    image: mcr.microsoft.com/devcontainers/python:1-3.13-bookworm
+    volumes:
+      - .:/workspaces/python-interview
+    ports:
+      - "8000:8000"
+    command: sleep infinity
+    working_dir: /workspaces/python-interview
+    networks:
+      - fastapi-network
+
+networks:
+  fastapi-network:
+    driver: bridge