fix: honor edge functions configuration in frameworks api config

[pieh]

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Summary

Fixes https://linear.app/netlify/issue/FRB-2307/frameworks-api-is-not-honoring-netifyv1configjsonedge-functions

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📝 Walkthrough

Walkthrough

Adds shared edge function property definitions and origin-specific validation, allowing name in user configuration while reserving generator. Frameworks API filtering now passes through edge_functions, and declaration merging collects metadata across matching declarations. New fixtures and tests verify routing, exclusions, metadata precedence, generated configuration, and validation behavior.

Estimated code review effort: 3 (Moderate) | ~25 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.
Title check	✅ Passed	The title clearly matches the main change: honoring edge functions configuration in the Frameworks API.
Description check	✅ Passed	The description includes the required Summary and checklist sections and is mostly complete for this repository.

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[github-actions]

This pull request adds or modifies JavaScript (.js, .cjs, .mjs) files.
Consider converting them to TypeScript.

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e18e dependency analysis

No dependency warnings found.

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commit: 055746b