Improve local auth env handling and fallbacks

Allow local env files to reliably override authentication feature flags (SMS/WeChat) by whitelisting keys in scripts/dev-utils.mjs and adding a unit test. Add SMS checks to scripts/check-api-server-env.mjs. Make server config.parse_bool tolerant of shell-wrapped quoted values (e.g. '"true"') and add tests so SMS_AUTH_ENABLED is parsed correctly when shells supply quotes. Update docs to clarify SMS env behaviour, restart requirements, and add guidance + a CSS fallback for old mobile browsers (QQ/X5) so public cover images render even when aspect-ratio is unsupported. Also include related frontend test and component adjustments and add puzzle onboarding handlers/endpoints in server-rs/crates/api-server/src/puzzle.rs.

scripts/dev-utils.test.ts

@@ -68,6 +68,26 @@ describe('dev utils env merge', () => {
     );
   });
 
+  test('本地认证开关覆盖外层 shell 旧值', () => {
+    withTempEnvFiles(
+      {
+        '.env.local': [
+          'SMS_AUTH_ENABLED=true',
+          'SMS_AUTH_PROVIDER=aliyun',
+        ].join('\n'),
+      },
+      (_env, tempDir) => {
+        const env = mergeApiServerEnv(tempDir, {
+          SMS_AUTH_ENABLED: 'false',
+          SMS_AUTH_PROVIDER: 'mock',
+        });
+
+        expect(env.SMS_AUTH_ENABLED).toBe('true');
+        expect(env.SMS_AUTH_PROVIDER).toBe('aliyun');
+      },
+    );
+  });
+
   test('空外层 shell 变量不会遮蔽本地私密配置', () => {
     withTempEnvFiles(
       {