refactor(security): migrate to component-based SecurityFilterChain (r…

[Nikhil-0710]

Description

This PR addresses the technical debt associated with the Spring Boot 3 upgrade by completely removing the deprecated WebSecurityConfigurerAdapter and replacing it with the modern component-based SecurityFilterChain architecture.

Closes #834

Changes Made:

• Removed extends WebSecurityConfigurerAdapter from SecurityConfig.java.
• Implemented @Bean for SecurityFilterChain utilizing lambda DSLs.
• Implemented @Bean for AuthenticationManager.
• Replaced deprecated antMatchers with requestMatchers.
• Maintained all existing CORS, CSP, and RBAC endpoint rules.
• Retained the custom validateJwtSecretConfiguration lifecycle hook.

Checklist:

• I have performed a self-review of my own code.
• Code compiles locally without errors (mvn clean compile).
• No unrelated environment files or target directories are included in this PR.
• Commit message follows Conventional Commits.

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[viru0909-dev]

Approved and merging. The test suite passes cleanly. Good work.