Add delete account feature to mobile app

- DELETE /api/auth/account/ API call in AuthApi + APILayer
- authProvider field on User model for email vs social auth detection
- DeleteAccountDialog with password (email) or "type DELETE" (social) confirmation
- Red "Delete Account" card on ProfileScreen
- Navigation wired in App.kt (clears data, returns to login)
- 10 i18n strings in strings.xml
- ViewModel unit tests for delete account state

composeApp/src/commonMain/kotlin/com/tt/honeyDue/network/APILayer.kt

@@ -1333,6 +1333,18 @@ object APILayer {
         return result
     }
 
+    suspend fun deleteAccount(password: String? = null, confirmation: String? = null): ApiResult<Unit> {
+        val token = getToken() ?: return ApiResult.Error("Not authenticated", 401)
+        val result = authApi.deleteAccount(token, DeleteAccountRequest(password = password, confirmation = confirmation))
+
+        // Clear DataManager on successful deletion
+        if (result is ApiResult.Success) {
+            DataManager.clear()
+        }
+
+        return result
+    }
+
     // ==================== Notification Operations ====================
 
     suspend fun registerDevice(request: DeviceRegistrationRequest): ApiResult<DeviceRegistrationResponse> {

composeApp/src/commonMain/kotlin/com/tt/honeyDue/network/AuthApi.kt

@@ -228,6 +228,26 @@ class AuthApi(private val client: HttpClient = ApiClient.httpClient) {
         }
     }
 
+    // Delete Account
+    suspend fun deleteAccount(token: String, request: DeleteAccountRequest): ApiResult<Unit> {
+        return try {
+            val response = client.delete("$baseUrl/auth/account/") {
+                header("Authorization", "Token $token")
+                contentType(ContentType.Application.Json)
+                setBody(request)
+            }
+
+            if (response.status.isSuccess()) {
+                ApiResult.Success(Unit)
+            } else {
+                val errorMessage = ErrorParser.parseError(response)
+                ApiResult.Error(errorMessage, response.status.value)
+            }
+        } catch (e: Exception) {
+            ApiResult.Error(e.message ?: "Unknown error occurred")
+        }
+    }
+
     // Google Sign In
     suspend fun googleSignIn(request: GoogleSignInRequest): ApiResult<GoogleSignInResponse> {
         return try {