Add application codebase: PDF annotation for e-Court

Next.js 14 + Drizzle/PostgreSQL + SSE realtime sync — highlight,
freehand, comment, bookmark + ฟีเจอร์ต่อยอด F1–F19 (edit/move, undo/redo,
shapes, redaction, export PDF/CSV, reply, resolve, search, summary,
textbox, stamp, version history)

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

app/api/annotations/export-csv/route.ts

@@ -0,0 +1,55 @@
+import { asc, eq } from "drizzle-orm";
+
+import { db } from "@/db";
+import { annotations, files, toAnnotationDTO } from "@/db/schema";
+import { annotationNote, annotationPreviewText, annotationTypeLabel } from "@/utils/annotation-display";
+import { csvField } from "@/utils/csv";
+import { encodeRFC5987 } from "@/utils/pdf-export";
+
+// Export สรุปหมายเหตุเป็น CSV (F16/D3) — ข้อมูลเดียวกับหน้าสรุป (F15)
+// ขึ้นต้นด้วย UTF-8 BOM เพื่อให้ Excel ภาษาไทยอ่านถูกต้อง (RFC 4180: ครอบ field
+// ด้วย double quote, ขึ้นบรรทัดใหม่ด้วย CRLF)
+
+const UUID_RE =
+  /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;
+
+export async function GET(req: Request) {
+  const fileId = new URL(req.url).searchParams.get("fileId") ?? "";
+  if (!UUID_RE.test(fileId)) {
+    return new Response("fileId ไม่ถูกต้อง", { status: 400 });
+  }
+
+  const [file] = await db.select().from(files).where(eq(files.id, fileId));
+  if (!file) return new Response("ไม่พบไฟล์นี้", { status: 404 });
+
+  const rows = await db
+    .select()
+    .from(annotations)
+    .where(eq(annotations.fileId, fileId))
+    .orderBy(asc(annotations.pageIndex), asc(annotations.createdAt));
+
+  const header = ["หน้า", "ชนิด", "ผู้เขียน", "ข้อความ", "โน้ต", "สร้างเมื่อ"];
+  const lines = rows.map((row) => {
+    const a = toAnnotationDTO(row);
+    return [
+      String(a.pageIndex + 1),
+      annotationTypeLabel(a),
+      a.userName,
+      annotationPreviewText(a),
+      annotationNote(a),
+      new Date(a.createdAt).toLocaleString("th-TH", { timeZone: "Asia/Bangkok" }),
+    ]
+      .map(csvField)
+      .join(",");
+  });
+  //  = UTF-8 BOM — ต้องเป็นตัวแรกสุดของไฟล์เสมอ
+  const csv = `${[header.map(csvField).join(","), ...lines].join("\r\n")}\r\n`;
+
+  const filename = encodeRFC5987(`${file.title}-summary.csv`);
+  return new Response(csv, {
+    headers: {
+      "content-type": "text/csv; charset=utf-8",
+      "content-disposition": `attachment; filename="summary.csv"; filename*=UTF-8''${filename}`,
+    },
+  });
+}