refactor Config to add Version and migratable

[cytown]

📝 Description

Removed usage of the Providers.AuthMethod field

cmd/picoclaw/internal/auth/helpers.go - Removed assignment to Providers..AuthMethod
web/backend/api/oauth.go - Removed synchronization of Providers..AuthMethod
pkg/voice/transcriber_test.go - Remove test cases for Providers.Groq
Configuration versioning migration feature

pkg/config/migration.go - Add loadConfigV0 and loadConfig functions to support automatic migration from legacy configurations
pkg/config/config.go - Modified to support versioned configurations
pkg/config/config_old.go - Added legacy configuration struct
Provider factory simplification

pkg/providers/factory.go - Significantly simplified, removed old provider logic
pkg/providers/factory_test.go - Removed related tests

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🗣️ Type of Change

• 🐞 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 📖 Documentation update
• ⚡ Code refactoring (no functional changes, no api changes)

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• 🤖 Fully AI-generated (100% AI, 0% Human)
• 🛠️ Mostly AI-generated (AI draft, Human verified/modified)
• 👨‍💻 Mostly Human-written (Human lead, AI assisted or none)

🔗 Related Issue

📚 Technical Context (Skip for Docs)

• Reference URL:
• Reasoning:

🧪 Test Environment

• Hardware: Apple MacBook Pro (x86_64)
• OS: macOS 12.6 (Darwin Kernel 22.6.0
• Model/Provider:
• Channels:

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☑️ Checklist

• My code/docs follow the style of this project.
• I have performed a self-review of my own changes.
• I have updated the documentation accordingly.

[yinwm]

Code Review

Found 1 issue that should be fixed before merging:

Agents config migration may lose user settings

In pkg/config/config_old.go:612-615:

// Merge agents config if workspace is set
if c.Agents.Defaults.Workspace != "" {
    cfg.Agents = c.Agents
}

Problem: User's Agents config (e.g., Provider, Model, MaxTokens) is only copied when Workspace is non-empty. If a user configured Model or Provider but didn't set Workspace, their settings will be lost after migration.

Example scenario:

• User has: {"agents": {"defaults": {"model": "gpt-4o", "provider": "openai"}}}
• After migration: Uses default config (user's model/provider settings lost)

Suggested fix:

// Always copy user's Agents config
cfg.Agents = c.Agents

// Ensure Workspace has a default if not set
if cfg.Agents.Defaults.Workspace == "" {
    homePath := getHomePath() // or reuse logic from DefaultConfig
    cfg.Agents.Defaults.Workspace = filepath.Join(homePath, "workspace")
}

---

Other than this, the PR looks good:

• Config versioning design is correct
• Provider factory simplification is appropriate (old factory.go logic replaced by factory_provider.go)
• Migration of Providers → ModelList works correctly

🤖 Generated with Claude Code

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[sky5454]

And, Singleton testing is best done by introducing old and new versions of the configuration file, and doing a real-world scenario test that can also be verified by CI

[cytown]

And, Singleton testing is best done by introducing old and new versions of the configuration file, and doing a real-world scenario test that can also be verified by CI

add test for this.

[sky5454]

Reviewed OK.

[yinwm]

LGTM