[esphome] Modernise board spec, web server v3, remove legacy options

[bharvey88]

Summary

• Remove redundant esp32: board: esp32-s3-devkitc-1 string from Core.yaml (variant: esp32s3 + flash_size: 8MB already present and sufficient)
• Add version: 3 to web_server: in Core.yaml (used by ETH variant) and R_PRO-1_W.yaml (WiFi variant overrides)
• Remove platformio_options: board_build.flash_mode: dio from R_PRO-1_W.yaml and R_PRO-1_ETH.yaml (not needed when using variant/flash_size spec)
• Remove legacy BLE wifi hooks (on_connect: ble.disable / on_disconnect: ble.enable) from R_PRO-1_W.yaml

Test plan

• esphome config validates cleanly for R_PRO-1_W.yaml and R_PRO-1_ETH.yaml
• OTA flash succeeds on a WiFi device
• OTA flash succeeds on an Ethernet device
• Web server UI loads at device IP on both variants

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing tests pass locally with my changes

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📥 Commits

Reviewing files that changed from the base of the PR and between eec54f5 and 07d495c.

📒 Files selected for processing (3)

• Integrations/ESPHome/Core.yaml
• Integrations/ESPHome/R_PRO-1_ETH.yaml
• Integrations/ESPHome/R_PRO-1_W.yaml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch esphome-modernisation

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