Refactor dev scripts: rename dev-safe and add modular service launch options

Problem

The current dev script naming is confusing:

• dev:safe isn't intuitive - it's really "agent-server + canvas only"
• dev:minimal is an alias for dev:safe adding to confusion
• No clear naming convention for different service combinations

Current Scripts

Script	What it runs
dev	All services (agent-server + automation + canvas)
dev:automation	All services (same as dev)
dev:safe / dev:minimal	Agent-server + Canvas
dev:frontend	Canvas only (assumes running backend)
dev:extra-backend	Extra standalone agent-server

Proposed Solution

Rename scripts with a clear naming convention based on which services are included:

New Name	Old Name	Services
dev	dev:automation	All (default: agent-server + automation + canvas)
dev:canvas	-	Canvas only (assumes running backend)
dev:server	dev:safe	Agent-server + Canvas
dev:server:only	-	Agent-server only (no canvas)
dev:full	dev:automation	Explicit all services
dev:extra-backend	-	Extra standalone agent-server (keep as is)

CLI Options (Nice-to-have)

The underlying script could support flags to selectively enable/disable services:

node scripts/dev.mjs --no-canvas        # Agent-server + automation only
node scripts/dev.mjs --no-automation    # Agent-server + canvas only  
node scripts/dev.mjs --server-only      # Just agent-server

Implementation Notes

1. Rename dev-safe.mjs to something clearer (e.g., dev-server.mjs)
2. Consolidate logic into a unified dev.mjs script with service toggles
3. Keep backward compatibility aliases during transition
4. Update DEVELOPMENT.md and AGENTS.md with new naming

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This issue was created by an AI agent (OpenHands) on behalf of the user.