Add HTTP API server, Android app, and CI build/publish pipeline

- docker-compose.yml + tooling-container/src/server.py: serve
  preprocess/OCR/extract over an async job API (POST /jobs, GET
  /jobs/{id}) instead of manual host-script runs per receipt
- android/: Kotlin/Compose app - capture a receipt photo, poll job
  progress, review/edit extracted fields, save locally (Room), export
  to CSV/ODS
- .gitea/workflows/build.yml: build the debug APK and publish it to
  dl.ladkau.de on push
- build-image.sh: also pull ollama/ollama so all pipeline images are
  ready after one script
- add project logo (also used for the app's launcher icon/splash)

android/app/build.gradle.kts

@@ -0,0 +1,79 @@
+plugins {
+    alias(libs.plugins.android.application)
+    alias(libs.plugins.kotlin.serialization)
+    alias(libs.plugins.kotlin.compose)
+    alias(libs.plugins.ksp)
+}
+
+android {
+    namespace = "de.ladkau.fuelish"
+    compileSdk = 36
+
+    defaultConfig {
+        applicationId = "de.ladkau.fuelish"
+        minSdk = 24
+        targetSdk = 36
+        versionCode = 1
+        versionName = "0.0.0-dev"
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = false
+            proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro")
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+
+    buildFeatures {
+        compose = true
+    }
+}
+
+// Compiles with an actual JDK 17 toolchain (auto-provisioned - see
+// settings.gradle.kts's foojay-resolver plugin) rather than whatever JDK
+// launched Gradle, so it stays in sync with android.compileOptions above
+// regardless of which JDK's on PATH.
+kotlin {
+    jvmToolchain(17)
+}
+
+// Regenerates app/src/main/res/{mipmap-*,drawable-nodpi}/* from ../../logo.png
+// (see scripts/gen_app_icons.py) - gitignored generated output, so a fresh
+// checkout needs it produced before any resource-merge/asset-packaging task
+// runs.
+val generateAppIcons = tasks.register<Exec>("generateAppIcons") {
+    workingDir = rootDir
+    commandLine("python3", "scripts/gen_app_icons.py")
+}
+
+tasks.named("preBuild") {
+    dependsOn(generateAppIcons)
+}
+
+dependencies {
+    implementation(libs.androidx.core.ktx)
+    implementation(libs.androidx.lifecycle.runtime.ktx)
+    implementation(libs.androidx.lifecycle.viewmodel.compose)
+    implementation(libs.androidx.activity.compose)
+    implementation(platform(libs.androidx.compose.bom))
+    implementation(libs.androidx.ui)
+    implementation(libs.androidx.ui.graphics)
+    implementation(libs.androidx.ui.tooling.preview)
+    implementation(libs.androidx.material3)
+    implementation(libs.androidx.material.icons.core)
+    implementation(libs.androidx.navigation.compose)
+    implementation(libs.androidx.datastore.preferences)
+    implementation(libs.androidx.core.splashscreen)
+    implementation(libs.androidx.room.runtime)
+    implementation(libs.androidx.room.ktx)
+    ksp(libs.androidx.room.compiler)
+    implementation(libs.kotlinx.serialization.json)
+    implementation(libs.kotlinx.coroutines.android)
+    implementation(libs.okhttp)
+    debugImplementation(libs.androidx.ui.tooling)
+}