Feature: Update kdm auth command to be interactive

[utkarsh232005]

🎯 Goal

Convert the kdm auth command from flag-based CLI operations into an interactive credential manager dashboard with a provider list, multi-step configuration wizard, and inline editing.

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📌 Current Behavior

kdm auth manages credentials, models, and endpoints for AI backend providers. KDM supports 10+ AI providers.

Subcommands:

Subcommand	Description
kdm auth add	Register credentials for a provider
kdm auth list	List all configured providers (API keys masked)
kdm auth default <backend>	Set the active default AI provider
kdm auth remove <backend>	Remove configured settings for a provider
kdm auth update <backend>	Update settings on a registered provider

Example usage:

kdm auth add -b openai -m gpt-4o -p sk-...
kdm auth default ollama
kdm auth list

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🚀 Proposed Interactive Dashboard

Layout

  AI Provider Manager
  ──────────────────────────────────

  Provider       Model          Status
  ─────────────────────────────────────
  > OpenAI       gpt-4o         ✔ Default
    Ollama       llama3.1       ✔ Configured
    Anthropic    —              ✖ Not configured
    Gemini       —              ✖ Not configured

  ──────────────────────────────────
  [A] Add  [E] Edit  [D] Set Default  [R] Remove  [Q] Quit

Add Provider Wizard (press A)

  ┌─ Add AI Provider ─────────────────────┐
  │                                       │
  │  Step 1/4 — Provider:  openai         │
  │  Step 2/4 — Model:     gpt-4o         │
  │  Step 3/4 — API Key:   ************   │
  │  Step 4/4 — Temp:      0.7            │
  │                                       │
  │  [ENTER] Next   [ESC] Cancel          │
  └───────────────────────────────────────┘

User Flow

1. User runs kdm auth → provider list loads.
2. Use ↑ / ↓ to highlight a provider.
3. Press a to open the Add Provider Wizard — a step-by-step form overlay.
4. Press e to edit the selected provider's settings.
5. Press d to set the selected provider as default.
6. Press r to remove the selected provider (with confirmation prompt).

Keyboard Shortcuts

Key	Action
↑ / ↓	Navigate providers
a	Add new provider (wizard)
e	Edit selected provider
d	Set as default
r	Remove provider
Enter	Next step in wizard
Esc	Cancel wizard
Q	Quit

Recommended Libraries

Component	Library
Text input (masked)	ink-text-input with mask="*"
Wizard state	React useState / useReducer
List	ink-select-input

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📋 Contribution Workflow

1. Fork the repo and create a feature branch (e.g., feature/interactive-kdm-auth).
2. Implement the interactive TUI for kdm auth using the layout and flow described above.
3. Submit a PR explicitly linked to this issue (e.g., Closes #140).
4. 📸 Include a screenshot or recording of the implemented UI in your PR to verify the new dashboard experience.