[esphome] Modernise board spec, web server v3, and API actions

[bharvey88]

Version: 25.12.18.2

What does this implement/fix?

Ports the modernisation changes from MTR-1 PR #74 to the AIR-1. All changes use newer ESPHome conventions and clean up legacy patterns.

Core.yaml

• esp32: replaced board: esp32-c3-devkitm-1 with variant: esp32c3 + flash_size: 4MB (new ESPHome board spec)
• web_server: added version: 3
• api: renamed services:/service: → actions:/action: for calibrate_co2_value and sen55_clean

AIR-1.yaml, AIR-1_BLE.yaml, AIR-1_Factory.yaml

• Removed platformio_options: board_build.flash_mode: dio (no longer needed with the new variant spec)

AIR-1_Factory.yaml

• Removed legacy on_connect/on_disconnect BLE enable/disable wifi hooks

Note: min_version was intentionally not changed.

Types of changes

• Bugfix (fixed change that fixes an issue)
• New feature (thanks!)
• Breaking change (repair/feature that breaks existing functionality)
• Dependency Update - Does not publish
• Other - Does not publish
• Website of github readme file update - Does not publish
• Github workflows - Does not publish

Checklist / Checklijst:

• The code change has been tested and works locally
• The code change has not yet been tested

If user-visible functionality or configuration variables are added/modified:

• Added/updated documentation for the web page

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📥 Commits

Reviewing files that changed from the base of the PR and between e523911 and 63e3b17.

📒 Files selected for processing (4)

• Integrations/ESPHome/AIR-1.yaml
• Integrations/ESPHome/AIR-1_BLE.yaml
• Integrations/ESPHome/AIR-1_Factory.yaml
• Integrations/ESPHome/Core.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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