feat: 初始化电信客户流失分析项目，完成数据读取和基础清洗

.gitignore

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+.venv/
+__pycache__/
+*.pyc
+results/

src/main.py

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+import polars as pl
+
+data_path = "C:/Users/s1313/Desktop/telco_churn_analysis/data/WA_Fn-UseC_-Telco-Customer-Churn.csv"
+
+try:
+    df = pl.read_csv(data_path)
+    
+    # 仅当TotalCharges是字符串类型时才处理
+    if df["TotalCharges"].dtype == pl.Utf8:
+        df = df.with_columns(
+            pl.col("TotalCharges").str.replace(" ", "0").cast(pl.Float64, strict=False)
+        )
+    
+    print("✅ 数据处理完成！")
+    print(f"TotalCharges类型：{df['TotalCharges'].dtype}")
+    print("\n前2行预览：")
+    print(df.head(2))
+except Exception as e:
+    print(f"❌ 操作失败：{e}")