Implement Sites API client

[Copilot]

Adds HTTP API client for Sites endpoints following the existing Devices API pattern.

Implementation

• Site model (sites/site.py): dataclass with id, name, created_at, updated_at
• Sites client (sites/client.py): CRUD operations matching API spec
  • create(name) → POST /v3/sites
  • get(site_id) → GET /v3/sites/{site_id}
  • update(site_id, name) → PATCH /v3/sites/{site_id}
  • list() → GET /v3/sites (paginated async generator, limit=50)
  • delete(site_id) → DELETE /v3/sites/{site_id}
• Integration: exposed via Client.sites property

Usage

async with enapter.http.api.Client(config) as client:
    site = await client.sites.create(name="Production")
    async for site in client.sites.list():
        print(site)
    await client.sites.update(site.id, name="Updated")
    await client.sites.delete(site.id)

Follows Devices API conventions: DTO serialization with from_dto()/to_dto(), error handling via api.check_error(), ISO datetime formatting.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Implement HTTP API Client: Sites API</issue_title>
<issue_description>- [ ] Create Site

• Get Site
• Update Site
• List Sites
• Delete Site</issue_description>

<agent_instructions>Use the current HTTP API client implementation (src/enapter/http/api) as a reference.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Implement HTTP API Client: Sites API #25

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[rnovatorov]

I've reviewed your changes and added a few fixes. LGTM now.