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

[bharvey88]

Version: 25.7.18.1

What does this implement/fix?

A set of non-breaking modernisation changes to keep the MSR-1 firmware in line with current ESPHome best practices:

Core.yaml

• Replace deprecated board: esp32-c3-devkitm-1 with explicit variant: esp32c3 + flash_size: 4MB — this is the current recommended way to target ESP32-C3 hardware with ESP-IDF
• Enable web server version 3 (version: 3) for the modern ESPHome dashboard UI

MSR-1.yaml, MSR-1_BLE.yaml, MSR-1_Factory.yaml

• Remove platformio_options: board_build.flash_mode: dio — no longer needed once the variant/flash_size spec is used

MSR-1_Factory.yaml

• Remove legacy wifi: on_connect/on_disconnect BLE hooks — these are no longer required

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 8522ad8 and 71e4527.

📒 Files selected for processing (4)

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