Add module build configs and platform expect/actual stubs

- composeApp/build.gradle.kts: KMP targets (android + iOS), all dependencies
- androidApp/build.gradle.kts: Android app with compose compiler
- Platform.kt expect/actual for Android and iOS
- Android resources: launcher icons, themes, manifest

Co-Authored-By: Claude Opus 4.6 (1M context)

Signed-off-by: Avinal Kumar <avinal.xlvii@gmail.com>

composeApp/build.gradle.kts

@@ -0,0 +1,82 @@
+import org.jetbrains.kotlin.gradle.dsl.JvmTarget
+
+plugins {
+    alias(libs.plugins.kotlin.multiplatform)
+    alias(libs.plugins.android.kmp.library)
+    alias(libs.plugins.compose.multiplatform)
+    alias(libs.plugins.compose.compiler)
+    alias(libs.plugins.kotlin.serialization)
+    alias(libs.plugins.ksp)
+    alias(libs.plugins.room)
+}
+
+kotlin {
+    @Suppress("DEPRECATION")
+    androidLibrary {
+        namespace = "com.avinal.memos.shared"
+        compileSdk = 36
+        minSdk = 26
+
+        compilerOptions {
+            jvmTarget.set(JvmTarget.JVM_11)
+        }
+    }
+
+    listOf(
+        iosArm64(),
+        iosSimulatorArm64()
+    ).forEach { iosTarget ->
+        iosTarget.binaries.framework {
+            baseName = "ComposeApp"
+            isStatic = true
+        }
+    }
+
+    sourceSets {
+        commonMain.dependencies {
+            implementation(compose.runtime)
+            implementation(compose.foundation)
+            implementation(compose.material3)
+            implementation(compose.materialIconsExtended)
+            implementation(compose.ui)
+            implementation(compose.components.resources)
+
+            implementation(libs.androidx.lifecycle.viewmodel)
+            implementation(libs.androidx.navigation.compose)
+            implementation(libs.androidx.datastore.preferences)
+            implementation(libs.kotlinx.coroutines.core)
+            implementation(libs.kotlinx.serialization.json)
+            implementation(libs.kotlinx.datetime)
+
+            implementation(libs.ktor.client.core)
+            implementation(libs.ktor.client.content.negotiation)
+            implementation(libs.ktor.serialization.kotlinx.json)
+
+            implementation(libs.coil.compose)
+            implementation(libs.coil.network.ktor)
+
+            implementation(libs.room.runtime)
+            implementation(libs.sqlite.bundled)
+        }
+
+        androidMain.dependencies {
+            implementation(libs.kotlinx.coroutines.android)
+            implementation(libs.ktor.client.okhttp)
+            implementation(libs.androidx.work.runtime)
+        }
+
+        iosMain.dependencies {
+            implementation(libs.ktor.client.darwin)
+        }
+    }
+}
+
+room {
+    schemaDirectory("$projectDir/schemas")
+}
+
+dependencies {
+    add("kspAndroid", libs.room.compiler)
+    add("kspIosSimulatorArm64", libs.room.compiler)
+    add("kspIosArm64", libs.room.compiler)
+}

composeApp/src/androidMain/kotlin/com/avinal/memos/Platform.android.kt

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+package com.avinal.memos
+
+actual fun getPlatformName(): String = "Android"

composeApp/src/commonMain/kotlin/com/avinal/memos/Platform.kt

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+package com.avinal.memos
+
+expect fun getPlatformName(): String

composeApp/src/iosMain/kotlin/com/avinal/memos/MainViewController.kt

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+package com.avinal.memos
+
+import androidx.compose.ui.window.ComposeUIViewController
+
+fun MainViewController() = ComposeUIViewController { App() }

composeApp/src/iosMain/kotlin/com/avinal/memos/Platform.ios.kt

@@ -0,0 +1,6 @@
+package com.avinal.memos
+
+import platform.UIKit.UIDevice
+
+actual fun getPlatformName(): String =
+    UIDevice.currentDevice.systemName() + " " + UIDevice.currentDevice.systemVersion