feat: implement activity resource and data source

docs/data-sources/activities.md

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+---
+# generated by https://github.com/hashicorp/terraform-plugin-docs
+page_title: "immich_activities Data Source - terraform-provider-immich"
+subcategory: ""
+description: |-
+  Retrieves a list of activities for an album or asset.
+---
+
+# immich_activities (Data Source)
+
+Retrieves a list of activities for an album or asset.
+
+## Example Usage
+
+```terraform
+data "immich_activities" "album_activities" {
+  album_id = "your-album-uuid"
+}
+
+output "all_comments" {
+  value = [for a in data.immich_activities.album_activities.activities : a.comment if a.type == "COMMENT"]
+}
+
+output "like_count" {
+  value = length([for a in data.immich_activities.album_activities.activities : a if a.type == "LIKE"])
+}
+```
+
+<!-- schema generated by tfplugindocs -->
+## Schema
+
+### Required
+
+- `album_id` (String) ID of the album.
+
+### Optional
+
+- `asset_id` (String) ID of the asset.
+
+### Read-Only
+
+- `activities` (Attributes List) List of activities. (see [below for nested schema](#nestedatt--activities))
+
+<a id="nestedatt--activities"></a>
+### Nested Schema for `activities`
+
+Read-Only:
+
+- `comment` (String) Comment text.
+- `created_at` (String) Timestamp when the activity was created.
+- `id` (String) Unique identifier for the activity.
+- `type` (String) Type of activity (COMMENT or LIKE).
+- `user_id` (String) ID of the user who performed the activity.

docs/resources/activity.md

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+---
+# generated by https://github.com/hashicorp/terraform-plugin-docs
+page_title: "immich_activity Resource - terraform-provider-immich"
+subcategory: ""
+description: |-
+  Manages an Immich activity (comment or like).
+---
+
+# immich_activity (Resource)
+
+Manages an Immich activity (comment or like).
+
+## Example Usage
+
+```terraform
+resource "immich_activity" "album_comment" {
+  album_id = "your-album-uuid"
+  type     = "comment"
+  comment  = "This is a great album!"
+}
+
+resource "immich_activity" "asset_like" {
+  album_id = "your-album-uuid"
+  asset_id = "your-asset-uuid"
+  type     = "like"
+}
+```
+
+<!-- schema generated by tfplugindocs -->
+## Schema
+
+### Required
+
+- `album_id` (String) ID of the album.
+- `type` (String) Type of activity (comment or like).
+
+### Optional
+
+- `asset_id` (String) ID of the asset.
+- `comment` (String) Comment text (required for type 'comment').
+
+### Read-Only
+
+- `created_at` (String) Timestamp when the activity was created.
+- `id` (String) Unique identifier for the activity.
+- `user_id` (String) ID of the user who performed the activity.