Use rich for table output; add uv project setup

- Replace manual column-width formatting with rich.Table
- Add pyproject.toml, uv.lock for dependency management
- Add .python-version (3.11) and .envrc for direnv/uv auto-setup
- Add main.py scaffold

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.envrc

@@ -0,0 +1,15 @@
+export PATH="/opt/homebrew/bin:$PATH"
+
+# 建 .venv（第一次用）
+if [ ! -d ".venv" ]; then
+    uv venv
+fi
+
+# 啟用（direnv 用 PATH 方式）
+export VIRTUAL_ENV="$PWD/.venv"
+export PATH="$VIRTUAL_ENV/bin:$PATH"
+
+# 有 pyproject.toml 就裝套件
+if [ -f "pyproject.toml" ]; then
+    uv sync
+fi