Improve API security and task management

[temichelle13]

Summary

• secure the Express app with helmet, configurable CORS, rate limiting, centralized error handling, and route wiring
• add validation-backed task and user endpoints with stronger mongoose models plus dependency updates to support them
• repair the client task form, script, and styles so tasks can be created safely and feedback is shown in the UI

Testing

• npm test

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https://chatgpt.com/codex/tasks/task_e_68cabb3730ac832aae9ba090288c20d1

[sonarqubecloud]

Quality Gate failed

Failed conditions
6.4% Duplication on New Code (required ≤ 3%)

See analysis details on SonarQube Cloud

[guardrails]

⚠️ We detected 3 security issues in this pull request:

Vulnerable Libraries (3)

Severity	Details
High	pkg:npm/express@4.21.2 (t) upgrade to: > 4.21.2
High	pkg:npm/morgan@1.10.1 (t) upgrade to: > 1.10.1
Medium	pkg:npm/express-validator@7.2.1 (t) upgrade to: > 7.2.1

More info on how to fix Vulnerable Libraries in JavaScript.

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