refactor: remove more dead "addons" code

[serhalp]

Summary

This is very old, unused code for something that no longer exists. Delete it.

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• Run ID: c8fea85f-486a-4083-9a45-b42b11584603

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Reviewing files that changed from the base of the PR and between bc007d2 and afdf219.

📒 Files selected for processing (13)

• CLAUDE.md
• eslint-suppressions.json
• src/commands/dev/dev.ts
• src/commands/functions/functions-create.ts
• src/commands/serve/serve.ts
• src/lib/edge-functions/registry.ts
• src/utils/addons/prepare.ts
• src/utils/dev.ts
• src/utils/env/index.ts
• src/utils/parse-raw-flags.ts
• src/utils/proxy-server.ts
• src/utils/proxy.ts
• src/utils/types.ts

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• netlify/blueprints (manual)

💤 Files with no reviewable changes (5)

• src/lib/edge-functions/registry.ts
• src/utils/addons/prepare.ts
• src/utils/env/index.ts
• src/utils/proxy.ts
• src/utils/proxy-server.ts

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📝 Summary

Summary by CodeRabbit

• Behavior Changes
  • Add-on-provided environment variables are no longer included in local development or edge-function configuration. Existing environment-variable sources and their precedence remain unchanged.
  • Local development and serving no longer route requests through add-on-specific proxy URLs.
  • Creating functions from templates or GitHub URLs no longer installs template add-ons or prompts for add-on setup.

Walkthrough

Environment-variable handling no longer includes addon-provided variables. Local development and serve flows no longer retrieve addon URLs or pass them to the proxy. Function-template scaffolding no longer installs template addons or runs addon-specific setup. The addon preparation helpers were deleted.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Refactor

Merge Risk: ⚪ Minimal · up to afdf2

This change removes unused addon code paths. No concrete regression is evident in the supplied changes, so it is low risk to merge after normal checks.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: removing obsolete addons code.
Description check	✅ Passed	The description states that the code is old, unused, and should be deleted, which directly relates to the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 6…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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📊 Benchmark results

Comparing with 0f2b082

• Dependency count: 1,019 (no change)
• Package size: 380 MB (no change)
• Number of ts-expect-error directives: 319 ⬇️ 3.76% decrease vs. 0f2b082

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commit: 6c6de6c

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The merge-base changed after approval.