fix: call initGroupFilesystem after ncl groups create

[jrnanocore]

Problem

ncl groups create inserts the agent_groups row but never calls initGroupFilesystem, so no container_configs row is created. When the host later tries to spawn a container for the new group, it fails with:

Container config not found for agent group: <id>

The host-sweep keeps retrying every 60 seconds but the container never starts.

Fix

Add an optional afterCreate hook to ResourceDef in crud.ts. Resources can use it to run post-insert side-effects without duplicating the generic create logic.

Wire it in the groups resource to call initGroupFilesystem, which:

• Creates the group directory under groups/<folder>/
• Creates CLAUDE.local.md
• Inserts the container_configs row via ensureContainerConfig
• Creates the .claude-shared/ directory and settings.json

Testing

1. ncl groups create --name test --folder test
2. Send a message to the new group
3. Container spawns successfully (previously: would loop with "Container config not found")

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