init: 폴더구조 설계 및 인프라 설계

terraform/modules/README.md

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+# Terraform Modules
+
+Modules are reusable package boundaries for infrastructure domains.
+
+Contract:
+- A module directory must represent one infrastructure domain.
+- Module internals must be reusable across environments.
+- Environment-specific values belong in `../environments/<env>/`, not in module defaults.
+- Placeholder modules must keep an explicit README contract until implemented or removed.

terraform/modules/compute/README.md

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+# compute Terraform Module
+
+Contract:
+- Owns reusable compute resources only.
+- Must expose inputs and outputs before an environment depends on it.
+- Must not contain environment-specific values.
+- Replace this contract with Terraform files when the module is implemented.

terraform/modules/database/README.md

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+# database Terraform Module
+
+Contract:
+- Owns reusable database resources only.
+- Must expose inputs and outputs before an environment depends on it.
+- Must not contain environment-specific values.
+- Replace this contract with Terraform files when the module is implemented.

terraform/modules/networking/README.md

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+# networking Terraform Module
+
+Contract:
+- Owns reusable networking resources only.
+- Must expose inputs and outputs before an environment depends on it.
+- Must not contain environment-specific values.
+- Replace this contract with Terraform files when the module is implemented.

terraform/modules/storage/README.md

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+# storage Terraform Module
+
+Contract:
+- Owns reusable storage resources only.
+- Must expose inputs and outputs before an environment depends on it.
+- Must not contain environment-specific values.
+- Replace this contract with Terraform files when the module is implemented.