tools: add scope column for capability model

Add a 'scope' TEXT column (default 'homelab') to the tools table so tools
can be namespaced by scope (e.g. "homelab:restart", "datacenter:reboot").
Backward-compat: bare name defaults to "homelab" scope.

Changes:
- Migration #1: ALTER TABLE tools ADD COLUMN scope
- store.Tool: add Scope field, update all SQL and scanTool()
- ipc.Tool DTO and request types: add Scope field
- CoreAPI interface: pass scope in ProposeTool/EnableTool
- storeAPI adapters: forward scope
- cmd/mavend/voice: pass scope (empty → homelab)
- cmd/mavweb/tools: show scope column in UI tables, hidden fields
- All tests updated for scope field
- Migration test made dynamic (startVer = len(migrations))

internal/ipc/client.go

@@ -309,16 +309,16 @@ func (c *Client) RecentNotes(ctx context.Context, n int) ([]Note, error) {
 	return out, nil
 }
 
-func (c *Client) ProposeTool(ctx context.Context, name, utterance string, ts time.Time) (bool, error) {
+func (c *Client) ProposeTool(ctx context.Context, name, utterance, scope string, ts time.Time) (bool, error) {
 	var r proposeToolResp
-	if err := c.call(ctx, MethodProposeTool, proposeToolReq{Name: name, Utterance: utterance, Ts: ts}, &r); err != nil {
+	if err := c.call(ctx, MethodProposeTool, proposeToolReq{Name: name, Scope: scope, Utterance: utterance, Ts: ts}, &r); err != nil {
 		return false, err
 	}
 	return r.Proposed, nil
 }
 
-func (c *Client) EnableTool(ctx context.Context, name string, cmd []string, destructive bool, ts time.Time) error {
-	return c.call(ctx, MethodEnableTool, enableToolReq{Name: name, Cmd: cmd, Destructive: destructive, Ts: ts}, nil)
+func (c *Client) EnableTool(ctx context.Context, name string, cmd []string, destructive bool, scope string, ts time.Time) error {
+	return c.call(ctx, MethodEnableTool, enableToolReq{Name: name, Scope: scope, Cmd: cmd, Destructive: destructive, Ts: ts}, nil)
 }
 
 func (c *Client) DisableTool(ctx context.Context, name string) error {