fix(release): 修正 R8 保留與 APK 打包

保留 protobuf-lite migration 欄位及 Biweekly 的資源查找名稱與反射成員，避免 minified release 無法還原登入資訊或解析正式行事曆。

同時排除編譯期 proto schema 並只保留繁體中文資源，在維持未壓縮 DEX 的前提下縮小 APK。

Author: alvin000009238

AGENTS.md

@@ -73,6 +73,9 @@
 ## Android R8 與安裝包大小
 
 - Release build 已啟用 `isMinifyEnabled` 與 `isShrinkResources`；新增 library 或功能時不要用 `-keep class androidx.**`、`-keep class org.jsoup.**` 這類 broad keep 擋住 R8。優先依賴 library 自帶的 consumer rules，只針對 app 端需要反射或跨版本保留名稱的入口加最小規則，例如 WorkManager worker class name，並用 `:app:assembleRelease` 比對 APK 大小。
+- `com.clhs.score.data.proto` 的 protobuf-lite message metadata 會以原始欄位名稱反射；minified release 必須保留這個 app-owned package 的 generated message 與欄位名稱。Debug build 不會重現欄位改名造成的 session migration 失敗，修改相關 R8 規則後需同時檢查 release DEX／mapping 與 `ArchitectureBoundaryTest`。
+- Biweekly 會透過 `Biweekly.class.getResourceAsStream("biweekly.properties")` 讀取相對路徑資源，並以反射建立 `biweekly.parameter.EnumParameterValue` 子類及列舉其 public static 常數；R8 必須保留 `biweekly.Biweekly` 類別名稱和這些 parameter constructor／欄位。只用簡化 ICS 驗證不足，修改規則後需以公開 Google Calendar 的完整 ICS 檢查 minified release parser。
+- App 只提供繁體中文介面，Android resources 只保留 default 與 `zh-TW` locale；APK 不需封裝編譯期 `.proto` schema。Release 保持預設的未壓縮 DEX，讓支援裝置直接 mmap，APK 體積最佳化不得為了 ZIP 檔案較小改回需要安裝時解壓 DEX 的 legacy packaging。
 
 ## Android FCM notifications
 

android/app/build.gradle.kts

@@ -100,6 +100,14 @@ android {
         }
     }
 
+    packaging {
+        resources.excludes += "**/*.proto"
+    }
+
+    androidResources {
+        localeFilters += "zh-rTW"
+    }
+
     lint {
         disable += "ChromeOsAbiSupport"
     }

android/app/proguard-rules.pro

@@ -6,6 +6,24 @@
   <fields>;
 }
 
+# protobuf-lite reflects generated field names from its message metadata. Keep
+# this small app-owned package intact because R8 can otherwise remove scalar
+# fields while leaving their names in the metadata.
+-keep class com.clhs.score.data.proto.** extends com.google.protobuf.GeneratedMessageLite {
+  *;
+}
+
+# Biweekly loads biweekly.properties relative to this class name.
+-keepnames class biweekly.Biweekly
+
+# Biweekly creates unknown iCalendar parameter values and discovers predefined
+# values through reflection.
+-keepclassmembers class biweekly.parameter.** extends biweekly.parameter.EnumParameterValue {
+  <init>(java.lang.String);
+  <init>(java.lang.String, biweekly.ICalVersion[]);
+  public static <fields>;
+}
+
 # kotlinx-serialization
 -keepattributes *Annotation*, InnerClasses, Signature
 -dontnote kotlinx.serialization.AnnotationsKt

android/app/src/test/java/com/clhs/score/ArchitectureBoundaryTest.kt

@@ -8,6 +8,45 @@ import java.nio.file.Path
 import java.nio.file.Paths
 
 class ArchitectureBoundaryTest {
+    @Test
+    fun releaseKeepsBiweeklyClassNameUsedForRelativeResourceLookup() {
+        val rules = readSource("app/proguard-rules.pro")
+
+        assertTrue(rules.contains("-keepnames class biweekly.Biweekly"))
+    }
+
+    @Test
+    fun releaseKeepsBiweeklyParameterMembersUsedByReflection() {
+        val rules = readSource("app/proguard-rules.pro")
+
+        assertTrue(
+            rules.contains(
+                """
+                -keepclassmembers class biweekly.parameter.** extends biweekly.parameter.EnumParameterValue {
+                  <init>(java.lang.String);
+                  <init>(java.lang.String, biweekly.ICalVersion[]);
+                  public static <fields>;
+                }
+                """.trimIndent(),
+            ),
+        )
+    }
+
+    @Test
+    fun releaseKeepsAppProtoFieldNamesUsedByLiteReflection() {
+        val rules = readSource("app/proguard-rules.pro")
+
+        assertTrue(
+            rules.contains(
+                """
+                -keep class com.clhs.score.data.proto.** extends com.google.protobuf.GeneratedMessageLite {
+                  *;
+                }
+                """.trimIndent(),
+            ),
+        )
+    }
+
     @Test
     fun sessionStorageKeepsCryptoMigrationAndBackupBoundaries() {
         val sessionStore = readSource("app/src/main/java/com/clhs/score/data/SessionStore.kt")