feat: add board functionality with articles and comments

- Implemented BoardView for creating and displaying articles with comments.
- Added NationAffairsView for managing national policies and financial settings.
- Created ScoutMessageView for editing recruitment messages.
- Introduced database migrations for board_post and board_comment tables.

packages/infra/prisma/game.prisma

@@ -318,3 +318,36 @@ model InheritanceUserState {
 
     @@map("inheritance_user_state")
 }
+
+model BoardPost {
+    id              Int      @id @default(autoincrement())
+    nationId        Int      @map("nation_id")
+    isSecret        Boolean  @default(false) @map("is_secret")
+    authorGeneralId Int      @map("author_general_id")
+    authorName      String   @map("author_name")
+    title           String
+    contentHtml     String   @map("content_html")
+    createdAt       DateTime @default(now()) @map("created_at")
+    updatedAt       DateTime @updatedAt @map("updated_at")
+
+    comments BoardComment[]
+
+    @@index([nationId, isSecret, createdAt])
+    @@map("board_post")
+}
+
+model BoardComment {
+    id              Int      @id @default(autoincrement())
+    postId          Int      @map("post_id")
+    nationId        Int      @map("nation_id")
+    isSecret        Boolean  @default(false) @map("is_secret")
+    authorGeneralId Int      @map("author_general_id")
+    authorName      String   @map("author_name")
+    contentText     String   @map("content_text")
+    createdAt       DateTime @default(now()) @map("created_at")
+
+    post BoardPost @relation(fields: [postId], references: [id], onDelete: Cascade)
+
+    @@index([postId, createdAt])
+    @@map("board_comment")
+}

packages/infra/prisma/migrations/20260128000000_add_board_tables/migration.sql

@@ -0,0 +1,26 @@
+CREATE TABLE "board_post" (
+    "id" SERIAL PRIMARY KEY,
+    "nation_id" INTEGER NOT NULL,
+    "is_secret" BOOLEAN NOT NULL DEFAULT FALSE,
+    "author_general_id" INTEGER NOT NULL,
+    "author_name" TEXT NOT NULL,
+    "title" TEXT NOT NULL,
+    "content_html" TEXT NOT NULL,
+    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updated_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX "board_post_nation_secret_created_idx" ON "board_post"("nation_id", "is_secret", "created_at");
+
+CREATE TABLE "board_comment" (
+    "id" SERIAL PRIMARY KEY,
+    "post_id" INTEGER NOT NULL REFERENCES "board_post"("id") ON DELETE CASCADE,
+    "nation_id" INTEGER NOT NULL,
+    "is_secret" BOOLEAN NOT NULL DEFAULT FALSE,
+    "author_general_id" INTEGER NOT NULL,
+    "author_name" TEXT NOT NULL,
+    "content_text" TEXT NOT NULL,
+    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX "board_comment_post_created_idx" ON "board_comment"("post_id", "created_at");