feat: Add multi-repository support for script synchronization

- Add Repository model to Prisma schema with migration
- Create repositoryService for managing repositories
- Add repositories API router with CRUD operations
- Update GitHubJsonService to support multiple repositories
- Update ScriptDownloaderService to use repository URL from scripts
- Add repository_url field to Script and ScriptCard types
- Add repository management UI tab to GeneralSettingsModal
- Display repository source on script cards and detail modal
- Implement repository deletion with JSON file cleanup
- Initialize default repositories (main and dev) on server startup

prisma/migrations/20251113125441_add_repositories/migration.sql

@@ -0,0 +1,14 @@
+-- CreateTable
+CREATE TABLE "repositories" (
+    "id" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
+    "url" TEXT NOT NULL,
+    "enabled" BOOLEAN NOT NULL DEFAULT true,
+    "is_default" BOOLEAN NOT NULL DEFAULT false,
+    "is_removable" BOOLEAN NOT NULL DEFAULT true,
+    "priority" INTEGER NOT NULL DEFAULT 0,
+    "created_at" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updated_at" DATETIME NOT NULL
+);
+
+-- CreateIndex
+CREATE UNIQUE INDEX "repositories_url_key" ON "repositories"("url");

prisma/schema.prisma

@@ -95,3 +95,16 @@ model LXCConfig {
   
   @@map("lxc_configs")
 }
+
+model Repository {
+  id          Int      @id @default(autoincrement())
+  url         String   @unique
+  enabled     Boolean  @default(true)
+  is_default  Boolean  @default(false)
+  is_removable Boolean @default(true)
+  priority    Int      @default(0)
+  created_at  DateTime @default(now())
+  updated_at  DateTime @updatedAt
+  
+  @@map("repositories")
+}