Add hometitle service: fuzzy matching engine and change detector FRE-5351

- matcher.service.ts: name/address normalization, Levenshtein distance,
  geocoding proximity, confidence scoring (0.0-1.0)
- change-detector.ts: PropertySnapshot diff engine, severity scoring
  (minor/moderate/major), configurable thresholds, alert triggering
- 57 unit tests with 98%+ coverage across all thresholds

services/hometitle/vitest.config.ts

@@ -0,0 +1,26 @@
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+  test: {
+    globals: true,
+    environment: 'node',
+    include: ['src/**/*.test.ts', 'test/**/*.test.ts'],
+    coverage: {
+      provider: 'v8',
+      reporter: ['text', 'json', 'html', 'lcov'],
+      reportsDirectory: './coverage',
+      include: ['src/**/*.ts'],
+      exclude: [
+        'src/**/*.d.ts',
+        '**/node_modules/**',
+        '**/test/**',
+      ],
+      thresholds: {
+        statements: 80,
+        branches: 80,
+        functions: 80,
+        lines: 80,
+      },
+    },
+  },
+});