fix: override MIME type for PDF uploads & fix build errors

- Fix PDF upload failing on Android due to wrong MIME type (image/pdf → application/pdf)
- Add safe JSON parsing for external storage responses with incorrect Content-Type headers
- Add detailed upload logging for debugging (file name, type, size, response status)
- Fix TypeScript error: missing prisma import in forum preview-report-posting route
- Fix ESLint warning: unescaped apostrophe in support-center page
- Add DEBUG_UPLOAD_FILE.md documentation for troubleshooting guide

Fixes upload issue where Android devices couldn't upload PDF files due to MIME type mismatch

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

src/app/api/mobile/forum/[id]/preview-report-posting/route.ts

@@ -1,3 +1,4 @@
+import { prisma } from "@/lib";
 import { NextResponse } from "next/server";
 
 export async function GET(