Implement Phase 1 tasks 1.1-1.4 (scaffold + core shell + Teltonika framing)

- Project scaffold (Node 22 + TS 5 + pnpm + vitest + ESLint flat config)
- Core shell: TCP server, session loop, adapter registry, types
- Configuration (zod-validated env) and pino logger
- Teltonika adapter: IMEI handshake, frame envelope, CRC-16/IBM,
  codec dispatch registry, DeviceAuthority seam (AllowAllAuthority default)

Codec data parsers (1.5-1.7), Redis publisher (1.8), and downstream
tasks remain. 36 tests covering CRC, framing, handshake, device
authority, config, and core server. typecheck/lint/test/build all clean.

vitest.config.ts

@@ -0,0 +1,18 @@
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+  test: {
+    include: ['test/**/*.test.ts'],
+    environment: 'node',
+    coverage: {
+      provider: 'v8',
+      reporter: ['text', 'lcov'],
+      include: ['src/**/*.ts'],
+    },
+  },
+  resolve: {
+    // Allow vitest to import .ts files without explicit extensions
+    // when referenced from test files that don't use .js suffixes
+    extensions: ['.ts', '.js'],
+  },
+});