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 -->

scripts/docs-update-icons.sh

@@ -6,6 +6,8 @@ FRIGATE="./src/camera-manager/frigate/assets/frigate.svg"
 IRIS="./src/images/iris.svg"
 MOTIONEYE="./src/camera-manager/motioneye/assets/motioneye.svg"
 REOLINK="./src/camera-manager/reolink/assets/reolink.svg"
+TPLINK="./src/camera-manager/tplink/assets/tplink.svg"
+
 DIR_ICONS="./docs/images/icons"
 
 copy() {
@@ -18,3 +20,4 @@ copy "$FRIGATE"
 copy "$IRIS"
 copy "$MOTIONEYE"
 copy "$REOLINK"
+copy "$TPLINK"