init: 폴더구조 설계 및 인프라 설계

terraform/environments/README.md

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+# Terraform Environments
+
+Each environment directory is a root module boundary.
+
+Contract:
+- `dev`, `staging`, and `prod` use the same entry pattern.
+- Environment roots may compose shared modules and set environment-specific values.
+- Environment roots must not duplicate reusable module internals.

terraform/environments/dev/README.md

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+# dev Terraform Environment
+
+Contract:
+- Owns only dev-specific Terraform root configuration.
+- Reuses modules from `../../modules` when modules exist.
+- Must not define reusable infrastructure patterns that belong in modules.
+- Add Terraform entry files here only when the dev environment is ready to be planned and applied.

terraform/environments/prod/README.md

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+# prod Terraform Environment
+
+Contract:
+- Owns only prod-specific Terraform root configuration.
+- Reuses modules from `../../modules` when modules exist.
+- Must not define reusable infrastructure patterns that belong in modules.
+- Add Terraform entry files here only when the prod environment is ready to be planned and applied.

terraform/environments/staging/README.md

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+# staging Terraform Environment
+
+Contract:
+- Owns only staging-specific Terraform root configuration.
+- Reuses modules from `../../modules` when modules exist.
+- Must not define reusable infrastructure patterns that belong in modules.
+- Add Terraform entry files here only when the staging environment is ready to be planned and applied.