Add SKIP_GPS_VALIDATION feature for attendance and visit services

- Introduced SKIP_GPS_VALIDATION environment variable to control GPS validation during check-ins and check-outs.
- Updated loadEnv function to parse SKIP_GPS_VALIDATION and enforce its rules based on NODE_ENV.
- Enhanced attendance and visit services to utilize the new configuration, allowing GPS validation to be skipped in development environments.
- Added unit tests to verify the behavior of SKIP_GPS_VALIDATION in various scenarios, ensuring proper handling in both production and development contexts.
- Updated check-in verification logic to respect the SKIP_GPS_VALIDATION option, improving flexibility in location checks.

src/config/env.spec.ts

@@ -17,6 +17,7 @@ describe('loadEnv', () => {
     expect(env.REFRESH_TOKEN_EXPIRES_IN_MS).toBe(7 * 24 * 60 * 60 * 1000);
     expect(env.BCRYPT_SALT_ROUNDS).toBe(10);
     expect(env.DEFAULT_TIMEZONE).toBe('GMT+7');
+    expect(env.SKIP_GPS_VALIDATION).toBe(false);
   });
 
   it('throws when DATABASE_URL is missing', () => {
@@ -75,4 +76,33 @@ describe('loadEnv', () => {
       }),
     ).toThrow('must match');
   });
+
+  it('enables SKIP_GPS_VALIDATION outside production', () => {
+    const env = loadEnv({
+      ...valid,
+      SKIP_GPS_VALIDATION: 'true',
+      NODE_ENV: 'development',
+    });
+
+    expect(env.SKIP_GPS_VALIDATION).toBe(true);
+  });
+
+  it('rejects SKIP_GPS_VALIDATION in production', () => {
+    expect(() =>
+      loadEnv({
+        ...valid,
+        SKIP_GPS_VALIDATION: 'true',
+        NODE_ENV: 'production',
+      }),
+    ).toThrow('cannot be enabled in production');
+  });
+
+  it('rejects invalid SKIP_GPS_VALIDATION values', () => {
+    expect(() =>
+      loadEnv({
+        ...valid,
+        SKIP_GPS_VALIDATION: 'yes',
+      }),
+    ).toThrow('must be true or false');
+  });
 });