feat(ci): Add provider API key validation to env_check.sh

[POWERFULMOVES]

Summary

Add pre-flight validation for LLM provider API keys to catch configuration issues before services start.

Changes

• Add check for core LLM providers (OpenAI, Anthropic, Groq, Gemini, Ollama)
• Warn if no LLM providers are configured
• Display status of optional API keys (ElevenLabs, Voyage, Cohere, Cloudflare)
• Detect empty/placeholder API key values (common mistake)

Example Output

Provider API Keys:
  Core LLM Providers (at least one recommended):
    ✓ OpenAI              configured
    • Anthropic           missing
    • Groq                missing
    • Google Gemini       missing
    • Ollama (local)      (will use http://localhost:11434)

  Optional API Keys:
    • ElevenLabs TTS                      not set (optional)
    • Voyage AI Embeddings                not set (optional)
    ...

  Checking for empty values:
    ✓ All API keys have values

Test Plan

• Run make env-check with no API keys set
• Run make env-check with one provider configured
• Verify warning appears for empty/placeholder values

Resolves CROSS_PLATFORM_TASKS.md Issue K3 (Priority 2).

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/api-key-validation

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[POWERFULMOVES]

Review: Approved ✅

This PR adds useful API key validation to env_check.sh.

Changes Incorporated

This feature has been incorporated into the PMOVES.AI-Edition-Hardened branch (commit 87d4293e).

Minor Suggestion for Follow-up

There's a load_env function defined in the new code that duplicates an existing function in the same file. Consider refactoring to reuse the existing function in a future cleanup PR.

This doesn't block approval - the feature is valuable as-is.