Add config file support (devcheck.yml)

[vidya381]

Let users customize devcheck behavior via a devcheck.yml file in the project root. Useful for projects with non-standard setups or extra required tools.

Initial scope:

• Define extra binaries to check (e.g. custom CLIs the project needs)
• Skip specific checks by name

Example config:

require:
  - terraform
  - aws
skip:
  - golangci-lint

Read and apply this config in cmd/devcheck/main.go before running checks.