feat: Add TPLink camera engine support (#2257)

* Related #2183

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Introduce `tplink` camera engine with relative PTZ via button
entities, add icons/docs support, refactor to `EntityCamera`, and extend
tests/schema/factory for auto-detection.
> 
> - **Engines**
>   - **New `tplink` engine**:
>     - Add `Engine.TPLink`, schema support (`engine: 'tplink'`).
> - Implement `TPLinkCameraManagerEngine` and `TPLinkCamera` (relative
PTZ via `button.*` entities; no presets/zoom; stop is no-op).
> - Update `engine-factory` to create/auto-detect `tplink` (platform
`tplink`).
> - **Refactor**
> - Replace `BrowseMediaCamera` with `EntityCamera`; update `motioneye`
and `reolink` cameras and `motioneye` engine type checks.
> - **UI/Icons**
> - Add `tplink.svg`; wire into `IconController`; update docs icon copy
script.
> - **Docs**
> - Add `tplink` to engine capability and live-provider matrices; new
`tplink` section incl. PTZ note; add custom icon entry.
> - **Tests**
> - Add TPLink camera/engine tests and factory tests; remove obsolete
`BrowseMediaCamera` test.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
74a688c3bd602912d63a22c3c6fa2f4b60ec14f9. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

src/camera-manager/entity-camera.ts

@@ -0,0 +1,33 @@
+import { Entity, EntityRegistryManager } from '../ha/registry/entity/types';
+import { HomeAssistant } from '../ha/types';
+import { localize } from '../localize/localize';
+import { Camera, CameraInitializationOptions } from './camera';
+import { CameraInitializationError } from './error';
+import { getCameraEntityFromConfig } from './utils/camera-entity-from-config';
+
+export interface EntityCameraInitializationOptions extends CameraInitializationOptions {
+  entityRegistryManager: EntityRegistryManager;
+  hass: HomeAssistant;
+}
+
+export class EntityCamera extends Camera {
+  protected _entity: Entity | null = null;
+
+  public async initialize(options: EntityCameraInitializationOptions): Promise<Camera> {
+    const config = this.getConfig();
+    const cameraEntityID = getCameraEntityFromConfig(config);
+    const entity = cameraEntityID
+      ? await options.entityRegistryManager.getEntity(options.hass, cameraEntityID)
+      : null;
+
+    if (!entity || !cameraEntityID) {
+      throw new CameraInitializationError(localize('error.no_camera_entity'), config);
+    }
+    this._entity = entity;
+    return await super.initialize(options);
+  }
+
+  public getEntity(): Entity | null {
+    return this._entity;
+  }
+}