feat: add HLS playback support with hls.js

- viewer.js: dynamic hls.js loading, HLS-aware panel creation, error handling
- schema.json: hlsManifest and mediaType fields (optional, backward compatible)
- types.ts: VideoEntry interface with MediaType type
- isHls() null guard fix
- tests: 39 tests (schema, viewer units, data flow, integration)
- CI: GitHub/Gitea Actions workflow (npm test on push/PR)
- deps: ajv, ajv-formats, jsdom for testing

__tests__/runner.mjs

@@ -0,0 +1,80 @@
+/**
+ * Minimal test runner — describe/it with timing and summary.
+ * No external dependencies. Import this from test files.
+ */
+
+const suites = [];
+let currentSuite = null;
+let totalTests = 0;
+let totalPassed = 0;
+let totalFailed = 0;
+const failures = [];
+
+export function describe(name, fn) {
+  currentSuite = { name, tests: [], passed: 0, failed: 0, duration: 0 };
+  suites.push(currentSuite);
+  fn();
+  currentSuite = null;
+}
+
+export function it(name, fn) {
+  if (!currentSuite) {
+    throw new Error(`it() called outside describe(). Test: "${name}"`);
+  }
+  currentSuite.tests.push({ name, fn, async: typeof fn === 'function' });
+}
+
+// Run all suites and print results
+export async function run() {
+  let globalStart = Date.now();
+
+  for (const suite of suites) {
+    const suiteStart = Date.now();
+    process.stdout.write(`\n${suite.name}\n${'─'.repeat(suite.name.length + 2)}\n`);
+
+    for (const test of suite.tests) {
+      totalTests++;
+      const testStart = Date.now();
+      try {
+        const result = test.fn();
+        if (result instanceof Promise) {
+          await result;
+        }
+        const ms = Date.now() - testStart;
+        totalPassed++;
+        suite.passed++;
+        process.stdout.write(`  ✓ ${test.name} (${ms}ms)\n`);
+      } catch (err) {
+        const ms = Date.now() - testStart;
+        totalFailed++;
+        suite.failed++;
+        failures.push({ suite: suite.name, test: test.name, error: err.message, stack: err.stack });
+        process.stdout.write(`  ✗ ${test.name} (${ms}ms)\n`);
+        process.stdout.write(`    → ${err.message}\n`);
+      }
+    }
+
+    suite.duration = Date.now() - suiteStart;
+  }
+
+  const totalMs = Date.now() - globalStart;
+
+  process.stdout.write(`\n${'='.repeat(60)}\n`);
+  process.stdout.write(`Results: ${totalPassed}/${totalTests} passed`);
+  if (totalFailed > 0) {
+    process.stdout.write(` | ${totalFailed} FAILED`);
+  }
+  process.stdout.write(` | ${totalMs}ms\n`);
+  process.stdout.write(`${'='.repeat(60)}\n`);
+
+  if (failures.length > 0) {
+    process.stdout.write(`\nFailures:\n`);
+    for (const f of failures) {
+      process.stdout.write(`  [${f.suite}] ${f.test}\n`);
+      process.stdout.write(`    Error: ${f.error}\n`);
+      process.stdout.write(`    ${f.stack.split('\n')[1].trim()}\n`);
+    }
+  }
+
+  return { totalTests, totalPassed, totalFailed, totalMs, failures };
+}