ci: modernize ESP-IDF builds and product documentation

[Y1hsiaochunnn]

Summary

• Add discovery-based GitHub Actions coverage for all 12 first-party ESP-IDF examples.
• Validate each example with ESP-IDF v5.5.4 and v6.0.2 (24 build jobs plus discovery).
• Align example manifests and configuration with the two CI lanes, including hosted Wi-Fi, display, audio, video, USB, and ESP-Brookesia examples.
• Modernize the English product README and add a complete Chinese README.
• Add the official product image, product and documentation links, example index, hardware overview, schematic link, and a clear factory-firmware boundary.
• Set the repository About website to the official Waveshare product page.

Repository shape

• ESP-IDF-only product repository; no Arduino surface is present.
• ESP32-P4 host with ESP32-C6 hosted wireless support.
• Local reusable components, ESP-Brookesia examples, hardware references, and a checked-in factory recovery image.

Validation

• No local firmware compilation was performed.
• Static preflight verified the repository inventory, all relative README targets, the product image, UTF-8 formatting, and a clean staged diff.
• GitHub Actions is the build source of truth: run 30510231741 passed all 25 jobs for commit b99a8ae.
• The workflow performs compile validation only and does not upload flashable artifacts.

References

• README structure: waveshareteam/ESP32-S3-Touch-AMOLED-2.16@92a5020
• Bilingual product documentation pattern: https://github.com/waveshareteam/ESP32-S3-Touch-LCD-1.69
• Product documentation: https://docs.waveshare.com/ESP32-P4-WIFI6-Touch-LCD-4.3