feat: add MCP marketplace and custom scrollbar styles

Add comprehensive CSS styles for the MCP Marketplace interface, including card hover effects, responsive grid layout, modal backdrop blur, category badges, rating stars, install buttons, and loading animations. Also include custom scrollbar styling for the model selector to enhance user experience and visual consistency.

database/database.ts

@@ -0,0 +1,34 @@
+import Database from "better-sqlite3";
+import path from "path";
+import fs from "fs";
+
+let db: Database.Database | null = null;
+
+export function getDatabase(): Database.Database {
+  if (!db) {
+    const dbPath = path.join(process.cwd(), "database", "ollahub.db");
+
+    // Garantir que o diretório existe
+    const dbDir = path.dirname(dbPath);
+    if (!fs.existsSync(dbDir)) {
+      fs.mkdirSync(dbDir, { recursive: true });
+    }
+
+    db = new Database(dbPath);
+
+    // Configurações de performance
+    db.pragma("journal_mode = WAL");
+    db.pragma("synchronous = NORMAL");
+    db.pragma("foreign_keys = ON");
+    db.pragma("cache_size = 10000");
+    db.pragma("temp_store = memory");
+  }
+  return db;
+}
+
+export function closeDatabase(): void {
+  if (db) {
+    db.close();
+    db = null;
+  }
+}