feat: 复刻小程序四大主页面与底部导航（UI 优先，本地 mock）

core/domain/src/main/kotlin/com/mingyuan/android_client/core/domain/repository/CheckinRepository.kt

@@ -0,0 +1,11 @@
+package com.mingyuan.android_client.core.domain.repository
+
+import com.mingyuan.android_client.core.model.CheckinRecord
+import com.mingyuan.android_client.core.model.CheckinStatus
+import kotlinx.coroutines.flow.Flow
+
+interface CheckinRepository {
+    fun observeCheckin(): Flow<CheckinRecord>
+
+    suspend fun submitCheckin(status: CheckinStatus)
+}

core/domain/src/main/kotlin/com/mingyuan/android_client/core/domain/repository/HomeRepository.kt

@@ -0,0 +1,8 @@
+package com.mingyuan.android_client.core.domain.repository
+
+import com.mingyuan.android_client.core.model.HomeData
+import kotlinx.coroutines.flow.Flow
+
+interface HomeRepository {
+    fun observeHome(): Flow<HomeData>
+}

core/domain/src/main/kotlin/com/mingyuan/android_client/core/domain/repository/PlanRepository.kt

@@ -0,0 +1,19 @@
+package com.mingyuan.android_client.core.domain.repository
+
+import com.mingyuan.android_client.core.model.PlanRecord
+import com.mingyuan.android_client.core.model.PlanSubmitData
+import com.mingyuan.android_client.core.model.PlanType
+import kotlinx.coroutines.flow.Flow
+
+interface PlanRepository {
+    fun observePlan(type: PlanType): Flow<PlanRecord>
+
+    fun observePlanSubmit(type: PlanType, periodKey: String): Flow<PlanSubmitData>
+
+    suspend fun savePlan(
+        type: PlanType,
+        periodKey: String,
+        content: String,
+        attachments: List<String>,
+    )
+}

core/domain/src/main/kotlin/com/mingyuan/android_client/core/domain/repository/ProfileRepository.kt

@@ -0,0 +1,10 @@
+package com.mingyuan.android_client.core.domain.repository
+
+import com.mingyuan.android_client.core.model.UserProfile
+import kotlinx.coroutines.flow.Flow
+
+interface ProfileRepository {
+    fun observeProfile(): Flow<UserProfile>
+
+    suspend fun deleteAccount()
+}