fix: register youcom plugin in core provider registration

[korderushi07]

The youcom plugin (You.com Web Search) was fully implemented at
packages/youcom/ but was missing from the core provider registry,
so it wasn't recognized by the type system, display-name lookup,
or provider list.

 This adds `youcom` to `BaseProviders`, `ProviderDisplayNames`, and 
 `AllProviders` in `packages/corsair/core/constants.ts`, in 
 alphabetical order, matching the existing pattern.

 Fixes #622

Summary by CodeRabbit

• New Features
  • Added You.com as a supported provider.
  • You.com is now available in provider selections and displays with its proper name.

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: f4afbf03-9a2b-4360-ad43-12c4e6d09e1a

📥 Commits

Reviewing files that changed from the base of the PR and between 99ade55 and d9034df.

📒 Files selected for processing (1)

• packages/corsair/core/constants.ts

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📝 Walkthrough

Walkthrough

The core provider registry now registers the You.com provider in its provider list, display-name map, and provider union type.

Changes

You.com provider registration

Layer / File(s)	Summary
Provider registry packages/corsair/core/constants.ts	Adds youcom to BaseProviders and AllProviders, and maps it to the display name You.com.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Possibly related PRs

• corsairdev/corsair#623: Makes the same three youcom registrations.
• corsairdev/corsair#647: Implements the same youcom registrations in constants.ts.
• corsairdev/corsair#648: Registers a provider in the same three definitions.

Suggested reviewers: yuvrxj-afk

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the registration of the You.com plugin in the core provider registry.
Linked Issues check	✅ Passed	The changes register youcom in BaseProviders, ProviderDisplayNames, and AllProviders as required by issue #622.
Out of Scope Changes check	✅ Passed	The changes are limited to the three provider registry updates required by issue #622.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[greptile-apps]

Greptile Summary

This PR registers the existing You.com plugin in Corsair’s shared provider vocabulary.

• Adds youcom to BaseProviders.
• Maps youcom to the You.com display name.
• Adds youcom to the AllProviders union.

Confidence Score: 5/5

The PR appears safe to merge with the You.com provider registered consistently across all required core declarations.

The added identifier matches the plugin’s existing youcom ID, the display name follows repository conventions, and all required registry representations remain synchronized.

Important Files Changed

Filename	Overview
packages/corsair/core/constants.ts	Consistently registers the existing youcom plugin across the provider ID list, display-name map, and provider union without introducing a defect.

_{Reviews (1): Last reviewed commit: "fix: register youcom plugin in core prov..." | Re-trigger Greptile}

[Dhirenderchoudhary]

Thanks for the contribution @korderushi07 Closing PR as PR #623 already exist.