release: bump to 1.0.1, enable R8 minification, ignore .claude dir

versionCode 1->2, versionName 0.1.0->1.0.1
isMinifyEnabled=true with proguard-android-optimize.txt
add proguard-rules.pro (keep Room, OkHttp, kotlinx.serialization)
gitignore: add .claude/ to suppress worktree noise

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

android/app/build.gradle.kts

@@ -14,13 +14,17 @@ android {
         applicationId = "me.hgsky.synq"
         minSdk = 31
         targetSdk = 36
-        versionCode = 1
-        versionName = "0.1.0"
+        versionCode = 2
+        versionName = "1.0.1"
     }
 
     buildTypes {
         release {
-            isMinifyEnabled = false
+            isMinifyEnabled = true
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro"
+            )
         }
     }