feat: initial implementation with docs and system_config

docs/resources/api_key.md

@@ -0,0 +1,36 @@
+---
+# generated by https://github.com/hashicorp/terraform-plugin-docs
+page_title: "immich_api_key Resource - terraform-provider-immich"
+subcategory: ""
+description: |-
+  Manages an Immich personal API key. Note that the secret is only available upon creation.
+---
+
+# immich_api_key (Resource)
+
+Manages an Immich personal API key. Note that the secret is only available upon creation.
+
+## Example Usage
+
+```terraform
+resource "immich_api_key" "example" {
+  name        = "Example API Key"
+  permissions = ["asset.read", "asset.upload"]
+}
+```
+
+<!-- schema generated by tfplugindocs -->
+## Schema
+
+### Required
+
+- `permissions` (List of String) List of permissions granted to this API key (e.g. `asset.read`, `asset.upload`).
+
+### Optional
+
+- `name` (String) Display name for the API key.
+
+### Read-Only
+
+- `id` (String) Unique identifier for the API key.
+- `secret` (String, Sensitive) The generated API key secret. This value is only returned when the key is created.