feat: user relay management, blog naddr sync, and OG image update

Add UserRelay API and dashboard relays tab with NIP-65 import, store post
naddr for Nostr articles, and ship Prisma migrations for board tables,
user relays, and post metadata.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/prisma/migrations/20260405073517_add_board_tables/migration.sql

@@ -0,0 +1,29 @@
+-- CreateTable
+CREATE TABLE IF NOT EXISTS "BoardInvoicePending" (
+    "paymentHash" TEXT NOT NULL PRIMARY KEY,
+    "content" TEXT NOT NULL,
+    "guestName" TEXT,
+    "pubkey" TEXT,
+    "profilePic" TEXT,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+-- CreateTable
+CREATE TABLE IF NOT EXISTS "BoardMessage" (
+    "id" TEXT NOT NULL PRIMARY KEY,
+    "paymentHash" TEXT NOT NULL,
+    "content" TEXT NOT NULL,
+    "authorName" TEXT NOT NULL,
+    "pubkey" TEXT,
+    "profilePic" TEXT,
+    "satsPaid" INTEGER NOT NULL,
+    "status" TEXT NOT NULL DEFAULT 'active',
+    "likeCount" INTEGER NOT NULL DEFAULT 0,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+-- CreateIndex
+CREATE UNIQUE INDEX IF NOT EXISTS "BoardMessage_paymentHash_key" ON "BoardMessage"("paymentHash");
+
+-- DropIndex (cleanup from organizer migration)
+DROP INDEX IF EXISTS "Meetup_organizerId_idx";

backend/prisma/migrations/20260405073752_add_user_relay/migration.sql

@@ -0,0 +1,12 @@
+-- CreateTable
+CREATE TABLE "UserRelay" (
+    "id" TEXT NOT NULL PRIMARY KEY,
+    "pubkey" TEXT NOT NULL,
+    "url" TEXT NOT NULL,
+    "read" BOOLEAN NOT NULL DEFAULT true,
+    "write" BOOLEAN NOT NULL DEFAULT true,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+-- CreateIndex
+CREATE UNIQUE INDEX "UserRelay_pubkey_url_key" ON "UserRelay"("pubkey", "url");

backend/prisma/migrations/20260405081139_add_post_naddr/migration.sql

@@ -0,0 +1,5 @@
+-- AlterTable: add naddr column to Post
+ALTER TABLE "Post" ADD COLUMN "naddr" TEXT;
+
+-- AlterTable: set default for content on Post (new rows only; existing rows keep their content)
+-- SQLite doesn't support ALTER COLUMN DEFAULT, but Prisma handles this at the client level.

backend/prisma/schema.prisma

@@ -61,9 +61,10 @@ model Media {
 model Post {
   id            String         @id @default(uuid())
   nostrEventId  String         @unique
+  naddr         String?
   title         String
   slug          String         @unique
-  content       String
+  content       String         @default("")
   excerpt       String?
   authorPubkey  String
   authorName    String?
@@ -117,6 +118,17 @@ model Relay {
   createdAt DateTime @default(now())
 }
 
+model UserRelay {
+  id        String   @id @default(uuid())
+  pubkey    String
+  url       String
+  read      Boolean  @default(true)
+  write     Boolean  @default(true)
+  createdAt DateTime @default(now())
+
+  @@unique([pubkey, url])
+}
+
 model Setting {
   id        String   @id @default(uuid())
   key       String   @unique