Refactor: Use cascade delete for repo auth

This commit simplifies the `RepoDao` by removing the manual deletion of authentication records when a repository is deleted.

Instead, it leverages Room's `onDelete = CASCADE` functionality in the `AuthenticationEntity`'s foreign key definition. This ensures that when a `RepoEntity` is deleted, its associated `AuthenticationEntity` records are automatically removed from the database.

The `deleteRepo` and `deleteAuth` methods in `RepoDao` have been removed as they are no longer necessary. Additionally, `stream()` and `repo()` methods have been added to `RepoDao` for observing repository data.

app/src/main/kotlin/com/looker/droidify/data/local/dao/RepoDao.kt

@@ -2,20 +2,19 @@ package com.looker.droidify.data.local.dao
 
 import androidx.room.Dao
 import androidx.room.Query
-import androidx.room.Transaction
+import com.looker.droidify.data.local.model.RepoEntity
+import kotlinx.coroutines.flow.Flow
 
 @Dao
 interface RepoDao {
 
+    @Query("SELECT * FROM repository")
+    fun stream(): Flow<List<RepoEntity>>
+
+    @Query("SELECT * FROM repository WHERE id = :repoId")
+    fun repo(repoId: Int): Flow<RepoEntity>
+
     @Query("DELETE FROM repository WHERE id = :id")
     suspend fun delete(id: Int)
 
-    @Query("DELETE FROM authentication WHERE repoId = :repoId")
-    suspend fun deleteAuth(repoId: Int)
-
-    @Transaction
-    suspend fun deleteRepo(repoId: Int) {
-        delete(repoId)
-        deleteAuth(repoId)
-    }
 }

app/src/main/kotlin/com/looker/droidify/data/local/model/AuthenticationEntity.kt

@@ -2,6 +2,7 @@ package com.looker.droidify.data.local.model
 
 import androidx.room.Entity
 import androidx.room.ForeignKey
+import androidx.room.ForeignKey.Companion.CASCADE
 import androidx.room.PrimaryKey
 import com.looker.droidify.data.encryption.Encrypted
 
@@ -12,8 +13,7 @@ import com.looker.droidify.data.encryption.Encrypted
             entity = RepoEntity::class,
             childColumns = ["repoId"],
             parentColumns = ["id"],
-//            Handles in dao
+            onDelete = CASCADE,
-//            onDelete = CASCADE,
         ),
     ],
 )