merge: integrate rebased feature/test into main

CHANGELOG.md

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+# Changelog
+
+## v1.0.0
+
+- Integrated login feature after resolving the configuration conflict.
+- Added login test cases after rebasing the test branch on the latest main branch.

config.txt

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+mode=login-integrated

src/login_module.c

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+/* Login feature source file for Git branch practice. */
+
+int Login_CheckCredentials(const char *user, const char *password)
+{
+    return (user != 0) && (password != 0);
+}

tests/login_test_cases.md

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+# Login Test Cases
+
+- Verify valid credentials can enter the login flow.
+- Verify null credentials are rejected.