feat: initialize k-tv-frontend with Next.js and Tailwind CSS

- Added package.json with dependencies and scripts for development, build, and linting.
- Created postcss.config.mjs for Tailwind CSS integration.
- Added SVG assets for UI components including file, globe, next, vercel, and window icons.
- Configured TypeScript with tsconfig.json for strict type checking and module resolution.

k-tv-backend/infra/src/factory.rs

@@ -0,0 +1,71 @@
+use std::sync::Arc;
+
+use crate::db::DatabasePool;
+use domain::{ChannelRepository, ScheduleRepository, UserRepository};
+
+#[derive(Debug, thiserror::Error)]
+pub enum FactoryError {
+    #[error("Database error: {0}")]
+    Database(#[from] sqlx::Error),
+    #[error("Not implemented: {0}")]
+    NotImplemented(String),
+    #[error("Infrastructure error: {0}")]
+    Infrastructure(#[from] domain::DomainError),
+}
+
+pub type FactoryResult<T> = Result<T, FactoryError>;
+
+pub async fn build_user_repository(pool: &DatabasePool) -> FactoryResult<Arc<dyn UserRepository>> {
+    match pool {
+        #[cfg(feature = "sqlite")]
+        DatabasePool::Sqlite(pool) => Ok(Arc::new(
+            crate::user_repository::SqliteUserRepository::new(pool.clone()),
+        )),
+        #[cfg(feature = "postgres")]
+        DatabasePool::Postgres(pool) => Ok(Arc::new(
+            crate::user_repository::PostgresUserRepository::new(pool.clone()),
+        )),
+        #[allow(unreachable_patterns)]
+        _ => Err(FactoryError::NotImplemented(
+            "No database feature enabled".to_string(),
+        )),
+    }
+}
+
+pub async fn build_channel_repository(
+    pool: &DatabasePool,
+) -> FactoryResult<Arc<dyn ChannelRepository>> {
+    match pool {
+        #[cfg(feature = "sqlite")]
+        DatabasePool::Sqlite(pool) => Ok(Arc::new(
+            crate::channel_repository::SqliteChannelRepository::new(pool.clone()),
+        )),
+        #[cfg(feature = "postgres")]
+        DatabasePool::Postgres(pool) => Ok(Arc::new(
+            crate::channel_repository::PostgresChannelRepository::new(pool.clone()),
+        )),
+        #[allow(unreachable_patterns)]
+        _ => Err(FactoryError::NotImplemented(
+            "No database feature enabled".to_string(),
+        )),
+    }
+}
+
+pub async fn build_schedule_repository(
+    pool: &DatabasePool,
+) -> FactoryResult<Arc<dyn ScheduleRepository>> {
+    match pool {
+        #[cfg(feature = "sqlite")]
+        DatabasePool::Sqlite(pool) => Ok(Arc::new(
+            crate::schedule_repository::SqliteScheduleRepository::new(pool.clone()),
+        )),
+        #[cfg(feature = "postgres")]
+        DatabasePool::Postgres(pool) => Ok(Arc::new(
+            crate::schedule_repository::PostgresScheduleRepository::new(pool.clone()),
+        )),
+        #[allow(unreachable_patterns)]
+        _ => Err(FactoryError::NotImplemented(
+            "No database feature enabled".to_string(),
+        )),
+    }
+}