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/lib.rs

@@ -0,0 +1,35 @@
+//! K-TV Infrastructure Layer
+//!
+//! Concrete adapters for the repository and provider ports defined in the domain.
+//!
+//! ## Repository adapters
+//! - `SqliteUserRepository` / `PostgresUserRepository`
+//! - `SqliteChannelRepository` / `PostgresChannelRepository`
+//! - `SqliteScheduleRepository` / `PostgresScheduleRepository`
+//!
+//! ## Media provider adapters
+//! - `JellyfinMediaProvider` (feature = `"jellyfin"`)
+//!
+//! ## Database
+//! - [`db::run_migrations`] — run all pending SQLite/Postgres migrations
+
+pub mod auth;
+pub mod db;
+pub mod factory;
+pub mod jellyfin;
+mod channel_repository;
+mod schedule_repository;
+mod user_repository;
+
+// Re-export for convenience
+pub use db::run_migrations;
+
+#[cfg(feature = "sqlite")]
+pub use user_repository::SqliteUserRepository;
+#[cfg(feature = "sqlite")]
+pub use channel_repository::SqliteChannelRepository;
+#[cfg(feature = "sqlite")]
+pub use schedule_repository::SqliteScheduleRepository;
+
+#[cfg(feature = "jellyfin")]
+pub use jellyfin::{JellyfinConfig, JellyfinMediaProvider};