feat: Refactor MeshService into smaller, single-responsibility components (#4108)

Signed-off-by: James Rich <2199651+jamesarich@users.noreply.github.com>

app/src/main/java/com/geeksville/mesh/service/MeshRouter.kt

@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2025 Meshtastic LLC
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.geeksville.mesh.service
+
+import kotlinx.coroutines.CoroutineScope
+import javax.inject.Inject
+import javax.inject.Singleton
+
+/**
+ * Orchestrates the specialized packet handlers for the [MeshService]. This class serves as a central registry and
+ * lifecycle manager for all routing sub-components.
+ */
+@Suppress("LongParameterList")
+@Singleton
+class MeshRouter
+@Inject
+constructor(
+    val dataHandler: MeshDataHandler,
+    val configHandler: MeshConfigHandler,
+    val tracerouteHandler: MeshTracerouteHandler,
+    val neighborInfoHandler: MeshNeighborInfoHandler,
+    val configFlowManager: MeshConfigFlowManager,
+    val mqttManager: MeshMqttManager,
+    val actionHandler: MeshActionHandler,
+) {
+    fun start(scope: CoroutineScope) {
+        dataHandler.start(scope)
+        configHandler.start(scope)
+        tracerouteHandler.start(scope)
+        neighborInfoHandler.start(scope)
+        configFlowManager.start(scope)
+        actionHandler.start(scope)
+    }
+}