Add Firmware Channel switching and serve the end-user image for OTA

[bharvey88]

Version: 26.7.7.1

What does this implement/fix?

Same Stable/Beta firmware switching as CAST-1 (naming per ApolloAutomation/CAST-1#43):

• Firmware Channel select (Stable/Beta) sets the OTA manifest URL via a new apply_ota_source script. Stable = GitHub Pages (main branch builds), Beta = rolling beta pre-release assets.
• Firmware Update button force-installs the selected channel's firmware. It re-applies the manifest URL first (so a just-switched channel is fetched before forcing) and temporarily disables BLE during the download to free heap for TLS (no-op on non-BLE images). It also prevents deep sleep for the download duration.
• Updates now serve the end-user image: BTN-1_Minimal.yaml (the adopted end-user config) gains the managed update system, and CI serves it at firmware/; BTN-1.yaml (improv + BLE) moves to firmware-factory/ for the web installer only. Fielded devices leave the improv image on their next update.
• build-beta.yml (new): pushes to beta build the end-user image(s) and publish them to a rolling beta pre-release with manifests rewritten to absolute URLs.
• update component id renamed firmware_update -> update_http_request to match the other Apollo repos.

Both images config-validated on ESPHome 2026.6.4. Not yet tested on hardware.

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

🤖 Generated with Claude Code

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 8af75d23-514a-4d6c-980f-d4893c33a65d

📥 Commits

Reviewing files that changed from the base of the PR and between 6b097fa and 4fd3a37.

📒 Files selected for processing (8)

• .github/workflows/build-beta.yml
• .github/workflows/build.yml
• Integrations/ESPHome/.gitignore
• Integrations/ESPHome/BTN-1.yaml
• Integrations/ESPHome/BTN-1_Minimal.yaml
• Integrations/ESPHome/Core.yaml
• Integrations/ESPHome/beta-channel/BTN-1_Minimal.yaml
• static/index.html

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch firmware-channel

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