IaC Code Generalization Layer

Add a wrapper layer or templating system to generalize hardcoded infrastructure.
We are building a DR site. Legacy infra uses hardcoded AZs, regions, IPs. We want a way to override those values at run-time without rewriting all the stacks.

• Support for param overrides by env/org/region

• Higher-level orchestration abstraction

• Impact: Easier DR rollout, improves code reuse and hygiene