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docs: refine template engine guides and validation

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# Streaming Async
Small ESPAsyncWebServer demo that exposes a captive portal over a SoftAP and renders a DFTE template directly to the HTTP response stream. It highlights:
This ESPAsyncWebServer example exposes a captive portal over a SoftAP and streams a DFTE template directly to each HTTP response. It demonstrates:
- Per-request `TemplateContext` ownership to avoid concurrent request clashes
- PROGMEM template with shared CSS/header/footer snippets
- Runtime data from RAM getters (uptime, connected station count)
- Captive portal DNS redirect so clients automatically receive the dashboard
- one request-scoped `TemplateContext` per response;
- a PROGMEM page with shared CSS/header/footer snippets;
- runtime getters for uptime and connected-station count;
- a captive-portal DNS redirect for browsers that support it.
## Build
```
```bash
pio run -d examples/StreamingAsync -e example_esp8266
See the shared [examples guide](../README.md) and [async web guidance](../../docs/ASYNC_WEB.md).
pio run -d examples/StreamingAsync -e example_esp32
```
Flash the board, connect to the SoftAP announced by the device (`DFTE-Portal-8266` or `DFTE-Portal-ESP32`, password `dfte-demo`), and your browser should automatically present the streamed dashboard. If it does not, navigate manually to `http://192.168.4.1/`.
## Run
1. Flash your target with `pio run -d examples/StreamingAsync -e <env> -t upload --upload-port <port>`.
2. Open the serial monitor at 115200 baud and confirm the SoftAP credentials.
3. Connect to `DFTE-Portal-8266` or `DFTE-Portal-ESP32` using password `dfte-demo`.
4. Browse to `http://192.168.4.1/` if the captive portal does not open automatically.
See the shared [examples guide](../README.md) and [async web guidance](../../docs/ASYNC_WEB.md).