Build a collection of typical security concern topics

# Task Description

We need to build a collection of typical security concern topics. These will then be used to produce a list of code examples that illustrate bad and good code.

* Injection vulnerabilities
* #9
* Command injection
* #8
* #11
* #12
* Malicious file uploads
* Authentication and authorization flaws
* #7
* Incomplete or missing security controls
* Broken access control
* #6
* Using `io.vertx.core.http.HttpClient`
* Using `io.vertx.reactivex.ext.web.client.WebClient`
* Insecure defaults and configurations
* Insecure data storage (e.g., plaintext passwords, sensitive data in logs)
* Insufficient session expiration and management
* Information leakage
* Denial of Service (DoS) attacks
* Lack of input validation
* Insecure deserialization
* Broken cryptography (e.g., weak algorithms, insufficient key length)
* Improper error handling
* Race conditions
* Use of unsafe or deprecated functions

# Open Questions

# Notes

# Task List

The following tasks will need to be carried out:
* [ ] Build a collection of topics.
* [ ] Add a brief summary for each topic
* [ ] Update the documentation.

# Useful Commands

# Incurred Costs

# Task Relationships

This task:
* Is a sub-task of: #
* Depends on: #
* Is a follow-up of: #
* Relates to: #

# Resources

# Useful Links

# Points of Contact

No file or test is named. Start by reviewing the existing repository structure and the referenced topics (#6–#12), then identify where the collection and summaries should live. Done means the typical security topics are collected, each has a brief summary, and the documentation is updated.

Written by the indexing model from the issue text.