feat: initial myprimal MQTT bridge service

Dynamic MySolem/MyIndygo IoT bridge with MQTT, Home Assistant
autodiscovery, and Homebridge EasyMQTT compatibility.

- Device discovery via MySolem API on startup (all modules/inputs/outputs)
- Configurable poll engine (fast/normal/slow buckets, per-input overrides)
- MQTT retained state publishing + HA autodiscovery payloads
- Unified manual command routing (linesControl vs sendManualModuleCommand)
- Runtime config via MQTT $config/set, persisted to config.json
- Expression override system (API-provided > hardcoded > passthrough)
- Minimal REST API: /health, /state, /control, /rediscover
- Docker deployment (Dockerfile + docker-compose.yml)
- 38 unit tests

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

test/input-types.test.js

@@ -0,0 +1,33 @@
+'use strict';
+const { getInputType } = require('../src/input-types');
+
+describe('getInputType', () => {
+  test('known types return correct descriptor', () => {
+    const ph = getInputType(6);
+    expect(ph.haComponent).toBe('sensor');
+    expect(ph.unit).toBe('pH');
+    expect(ph.pollBucket).toBe('fast');
+    expect(ph.expression).toBeTruthy();
+
+    const moisture = getInputType(12);
+    expect(moisture.haComponent).toBe('sensor');
+    expect(moisture.deviceClass).toBe('humidity');
+    expect(moisture.pollBucket).toBe('normal');
+
+    const rain = getInputType(2);
+    expect(rain.haComponent).toBe('binary_sensor');
+    expect(rain.pollBucket).toBe('slow');
+  });
+
+  test('unknown type returns fallback sensor with _unknown flag', () => {
+    const unknown = getInputType(999);
+    expect(unknown.haComponent).toBe('sensor');
+    expect(unknown._unknown).toBe(true);
+    expect(unknown.expression).toBeNull();
+  });
+
+  test('binary_sensor types have no unit', () => {
+    expect(getInputType(21).unit).toBeNull();
+    expect(getInputType(149).unit).toBeNull();
+  });
+});