fix(planting-service): 使用楷体 STKAITI.ttf 替换无效字体

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/services/planting-service/src/infrastructure/pdf/pdf-generator.service.ts

@@ -47,7 +47,7 @@ export class PdfGeneratorService {
     );
     this.fontPath = path.join(
       __dirname,
-      '../../../templates/fonts/NotoSansSC-Regular.ttf',
+      '../../../templates/fonts/STKAITI.ttf',
     );
   }