fix: 优化文件名判断逻辑

- 将判断逻辑从 sourcePath 改为 sourceFileName，提高代码准确性和可读性
- 优化了 EJS 文件、下划线文件和点文件的判断逻辑

Author: cloudcome

src/Creator.ts

@@ -148,9 +148,9 @@ export class Creator<T extends Record<string, unknown>> extends TypedEvents<{
       const sourceFolder = path.dirname(sourcePath);
       const sourceFile = path.join(context.templateRoot, sourcePath);
 
-      const isEjsFile = EJS_FILE_REGEX.test(sourcePath);
-      const isUnderscoreFile = sourcePath.startsWith(UNDERSCORE_FILE_PREFIX);
-      const isDotFile = !isUnderscoreFile && sourcePath.startsWith(DOT_FILE_PREFIX);
+      const isEjsFile = EJS_FILE_REGEX.test(sourceFileName);
+      const isUnderscoreFile = sourceFileName.startsWith(UNDERSCORE_FILE_PREFIX);
+      const isDotFile = !isUnderscoreFile && sourceFileName.startsWith(DOT_FILE_PREFIX);
 
       let start = 0;
       let end = undefined;