[chiragjangiir]

Summary

Closes #7283. Supersedes #7292 (which was inadvertently branched from a release tag rather than main, causing base divergence).

In mcpgateway/admin.py, the search inputs in the Manage Members modal and the password validation fields in the user edit modal previously used inline oninput="..." handlers. Under the default Content Security Policy (script-src-attr 'none'), modern browsers block inline event handlers, rendering these inputs inert.

Solution

• Converted oninput handlers in mcpgateway/admin.py to use data-driven event delegation (data-action-input="debouncedMemberSearch", data-action-input="debouncedNonMemberSearch", and data-action-input="validatePassword").
• Added input event delegation adapter in mcpgateway/admin_ui/search.js to accept the delegated input event and retrieve event.target.value while defaulting delay cleanly.
• Exported and wired validatePassword in mcpgateway/admin_ui/teams.js and exposed it via Admin in mcpgateway/admin_ui/admin.js.
• Added unit tests in tests/unit/js/search.test.js and tests/unit/js/teams.test.js verifying event delegation handling.
• Added integration test in tests/integration/test_admin_teams_ui.py verifying no inline oninput= is emitted and delegated attributes are present.

Verification

• Ran Vitest unit tests: tests/unit/js/search.test.js and tests/unit/js/teams.test.js passed (192 tests passing).
• Ran ESLint: Clean on all touched JS files.
• Verified diff cleanly contains only the 7 target files with 1 commit ahead of upstream main.