Add QA test outputs, build scripts, and Dockerfile validation

- Created `qa-test-output-after-fix.txt` and `qa-test-output.txt` to log results of certificate page authentication tests.
- Added `build.sh` for deterministic backend builds in CI, utilizing `go list` for efficiency.
- Introduced `codeql_scan.sh` for CodeQL database creation and analysis for Go and JavaScript/TypeScript.
- Implemented `dockerfile_check.sh` to validate Dockerfiles for base image and package manager mismatches.
- Added `sourcery_precommit_wrapper.sh` to facilitate Sourcery CLI usage in pre-commit hooks.

frontend/src/api/client.ts

@@ -0,0 +1,20 @@
+import axios from 'axios';
+
+const client = axios.create({
+  baseURL: '/api/v1',
+  withCredentials: true, // Required for HttpOnly cookie transmission
+  timeout: 30000, // 30 second timeout
+});
+
+// Global 401 error logging for debugging
+client.interceptors.response.use(
+  (response) => response,
+  (error) => {
+    if (error.response?.status === 401) {
+      console.warn('Authentication failed:', error.config?.url);
+    }
+    return Promise.reject(error);
+  }
+);
+
+export default client;