Add `createos scale` command — adjust replicas and resources

[naman485]

Problem

Scaling replicas and adjusting CPU/memory resources requires the web dashboard or direct API calls. For production workloads, being able to scale quickly from the terminal is critical — especially during incidents.

The API already supports UpdateProjectEnvironmentResources, but there's no CLI command for it.

Proposed Solution

Add a createos scale command for adjusting replicas and resource allocation.

Usage

# Scale replicas
createos scale --replicas 3

# Adjust resources
createos scale --cpu 500m --memory 1024

# Scale a specific project/environment
createos scale --project <id> --environment <id> --replicas 2

# View current scale settings
createos scale --show

Display

$ createos scale --replicas 3 --cpu 500m

  Scaling my-api (production)...

  ┌──────────┬─────────┬─────────┐
  │          │ Before  │ After   │
  ├──────────┼─────────┼─────────┤
  │ Replicas │ 1       │ 3       │
  │ CPU      │ 200m    │ 500m    │
  │ Memory   │ 512MB   │ 512MB   │
  └──────────┴─────────┴─────────┘

  ✓ Scaling complete.

Validation

• Enforce platform limits: CPU 200–500m, Memory 500–1024MB, Replicas 1–3
• Show clear error if user requests beyond limits:

  Error: CPU must be between 200m and 500m (requested: 800m)
  

• Confirm before scaling down (fewer replicas or less resources)

Show current scale

$ createos scale --show

  my-api (production)
  ──────────────────────
  Replicas:  2 / 3 max
  CPU:       200m (limit: 500m)
  Memory:    512MB (limit: 1024MB)

Implementation Notes

• New file: cmd/scale/scale.go
• Uses UpdateProjectEnvironmentResources API method (may need to add to internal/api/methods.go)
• Auto-detect project from .createos.json (depends on Add createos init command — link local projects to CreateOS #4)
• Register in root.go commands and home screen