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/domain/src/repositories.rs

@@ -0,0 +1,71 @@
+//! Repository ports (traits)
+//!
+//! These traits define the interface for data persistence.
+//! Implementations live in the infra layer.
+
+use async_trait::async_trait;
+use chrono::DateTime;
+use chrono::Utc;
+use uuid::Uuid;
+
+use crate::entities::{Channel, GeneratedSchedule, PlaybackRecord, User};
+use crate::errors::DomainResult;
+use crate::value_objects::{ChannelId, UserId};
+
+/// Repository port for User persistence
+#[async_trait]
+pub trait UserRepository: Send + Sync {
+    /// Find a user by their internal ID
+    async fn find_by_id(&self, id: Uuid) -> DomainResult<Option<User>>;
+
+    /// Find a user by their OIDC subject (used for authentication)
+    async fn find_by_subject(&self, subject: &str) -> DomainResult<Option<User>>;
+
+    /// Find a user by their email
+    async fn find_by_email(&self, email: &str) -> DomainResult<Option<User>>;
+
+    /// Save a new user or update an existing one
+    async fn save(&self, user: &User) -> DomainResult<()>;
+
+    /// Delete a user by their ID
+    async fn delete(&self, id: Uuid) -> DomainResult<()>;
+}
+
+/// Repository port for `Channel` persistence.
+#[async_trait]
+pub trait ChannelRepository: Send + Sync {
+    async fn find_by_id(&self, id: ChannelId) -> DomainResult<Option<Channel>>;
+    async fn find_by_owner(&self, owner_id: UserId) -> DomainResult<Vec<Channel>>;
+    /// Insert or update a channel.
+    async fn save(&self, channel: &Channel) -> DomainResult<()>;
+    async fn delete(&self, id: ChannelId) -> DomainResult<()>;
+}
+
+/// Repository port for `GeneratedSchedule` and `PlaybackRecord` persistence.
+#[async_trait]
+pub trait ScheduleRepository: Send + Sync {
+    /// Find the schedule whose `[valid_from, valid_until)` window contains `at`.
+    async fn find_active(
+        &self,
+        channel_id: ChannelId,
+        at: DateTime<Utc>,
+    ) -> DomainResult<Option<GeneratedSchedule>>;
+
+    /// Find the most recently generated schedule for a channel.
+    /// Used to derive the next generation number.
+    async fn find_latest(
+        &self,
+        channel_id: ChannelId,
+    ) -> DomainResult<Option<GeneratedSchedule>>;
+
+    /// Insert or replace a generated schedule.
+    async fn save(&self, schedule: &GeneratedSchedule) -> DomainResult<()>;
+
+    /// All playback records for a channel, used by the recycle policy engine.
+    async fn find_playback_history(
+        &self,
+        channel_id: ChannelId,
+    ) -> DomainResult<Vec<PlaybackRecord>>;
+
+    async fn save_playback_record(&self, record: &PlaybackRecord) -> DomainResult<()>;
+}