migrate(local-db): replace Room with SQLDelight for JS/WASM compatibility

Replaced Room with SQLDelight for improved multiplatform support, enabling JavaScript and WebAssembly targets. Added custom database driver implementations for JVM, JS, and WASM. Updated Gradle configurations, dependencies, and project structure accordingly.

frontend/core/local-db/src/wasmJsMain/kotlin/at/mocode/frontend/core/localdb/DatabaseDriverFactory.wasmJs.kt

@@ -0,0 +1,19 @@
+package at.mocode.frontend.core.localdb
+
+import app.cash.sqldelight.db.SqlDriver
+import app.cash.sqldelight.driver.worker.WebWorkerDriver
+import org.w3c.dom.Worker
+
+actual class DatabaseDriverFactory {
+    actual suspend fun createDriver(): SqlDriver {
+        // Same as JS, we use a Web Worker for Wasm to support OPFS
+        val worker = Worker(
+            js("""new URL("sqlite.worker.js", import.meta.url)""")
+        )
+        val driver = WebWorkerDriver(worker)
+
+        AppDatabase.Schema.create(driver).await()
+
+        return driver
+    }
+}

frontend/core/local-db/src/wasmJsMain/resources/sqlite.worker.js

@@ -0,0 +1,23 @@
+import { runWorker } from '@cashapp/sqldelight-sqljs-worker';
+import sqlite3InitModule from '@sqlite.org/sqlite-wasm';
+
+sqlite3InitModule({
+    print: console.log,
+    printErr: console.error,
+}).then((sqlite3) => {
+    const opfsAvailable = 'opfs' in sqlite3;
+
+    runWorker({
+        driver: {
+            open: (name) => {
+                if (opfsAvailable) {
+                    console.log("Initialisiere persistente OPFS Datenbank: " + name);
+                    return new sqlite3.oo1.OpfsDb(name);
+                } else {
+                    console.warn("OPFS nicht verfügbar, Fallback auf In-Memory");
+                    return new sqlite3.oo1.DB(name);
+                }
+            }
+        }
+    });
+});