feat: add APK filename parser utilities

- Add detectEnvironment() to parse environment from APK filenames
- Add parseApkFilename() to extract environment and commit ID metadata
- Support dev, sandbox, product, and other environment types
- Map environment patterns: timeshift, lan, dev -> dev; sandbox -> sandbox
- Detect product APKs when no environment suffix present
- Handle invalid formats gracefully

lib/__tests__/apk-parser.test.ts

@@ -0,0 +1,56 @@
+import { parseApkFilename, detectEnvironment } from '../apk-parser';
+
+describe('parseApkFilename', () => {
+  it('should parse APK with environment suffix', () => {
+    const result = parseApkFilename('ft_timeshift_0_42_57ef3a60d.apk');
+    expect(result.environment).toBe('dev');
+    expect(result.commit).toBe('57ef3a60d');
+    expect(result.isValid).toBe(true);
+  });
+
+  it('should parse APK without environment (product)', () => {
+    const result = parseApkFilename('ft_0_42_ff9ff3441.apk');
+    expect(result.environment).toBe('product');
+    expect(result.commit).toBe('ff9ff3441');
+    expect(result.isValid).toBe(true);
+  });
+
+  it('should parse sandbox APK', () => {
+    const result = parseApkFilename('ft_sandbox_0_42_57ef3a60d.apk');
+    expect(result.environment).toBe('sandbox');
+    expect(result.commit).toBe('57ef3a60d');
+    expect(result.isValid).toBe(true);
+  });
+
+  it('should handle invalid format', () => {
+    const result = parseApkFilename('invalid_filename.apk');
+    expect(result.environment).toBe('other');
+    expect(result.commit).toBeNull();
+    expect(result.isValid).toBe(false);
+  });
+
+  it('should handle missing commit ID', () => {
+    const result = parseApkFilename('ft_dev_0_42.apk');
+    expect(result.environment).toBe('dev');
+    expect(result.commit).toBeNull();
+    expect(result.isValid).toBe(false);
+  });
+});
+
+describe('detectEnvironment', () => {
+  it('should detect dev environment', () => {
+    expect(detectEnvironment('ft_timeshift_0_42_57ef3a60d.apk')).toBe('dev');
+  });
+
+  it('should detect sandbox environment', () => {
+    expect(detectEnvironment('ft_sandbox_0_42_57ef3a60d.apk')).toBe('sandbox');
+  });
+
+  it('should detect product environment (no suffix)', () => {
+    expect(detectEnvironment('ft_0_42_ff9ff3441.apk')).toBe('product');
+  });
+
+  it('should return other for unknown environments', () => {
+    expect(detectEnvironment('ft_unknown_0_42_57ef3a60d.apk')).toBe('other');
+  });
+});