Add user names, team-scoped sandbox guard, and login robustness fixes

- Add name column to users (migration + sqlc regen); propagate through JWT
  claims, auth context, all auth/OAuth handlers, service layer, and frontend
- Sidebar and team page show name instead of email; team page splits Name/Email
  into separate columns
- Block sandbox creation in UI and API when user has no active team context
- loginTeam helper falls back to first active team when no default is set,
  fixing login for invited users with no is_default membership
- Exclude soft-deleted teams from GetDefaultTeamForUser, GetBYOCTeams queries
- Guard host creation against soft-deleted teams in service/host.go
- SwitchTeam re-fetches name from DB instead of trusting stale JWT claim
- Reset teams store on login so stale data from a previous session never persists
- Update openapi.yaml: add name to SignupRequest and AuthResponse schemas

frontend/src/lib/api/auth.ts

@@ -3,6 +3,7 @@ export type AuthResponse = {
 	user_id: string;
 	team_id: string;
 	email: string;
+	name: string;
 };
 
 export type AuthResult = { ok: true; data: AuthResponse } | { ok: false; error: string };
@@ -11,8 +12,8 @@ export async function apiLogin(email: string, password: string): Promise<AuthRes
 	return authFetch('/api/v1/auth/login', { email, password });
 }
 
-export async function apiSignup(email: string, password: string): Promise<AuthResult> {
-	return authFetch('/api/v1/auth/signup', { email, password });
+export async function apiSignup(email: string, password: string, name: string): Promise<AuthResult> {
+	return authFetch('/api/v1/auth/signup', { email, password, name });
 }
 
 async function authFetch(url: string, body: Record<string, string>): Promise<AuthResult> {

frontend/src/lib/api/team.ts

@@ -2,6 +2,7 @@ import { apiFetch, type ApiResult } from '$lib/api/client';
 
 export type TeamMember = {
 	user_id: string;
+	name: string;
 	email: string;
 	role: 'owner' | 'admin' | 'member';
 	joined_at: string;
@@ -42,7 +43,7 @@ export async function createTeam(name: string): Promise<ApiResult<TeamWithRole>>
 
 export async function switchTeam(
 	teamId: string
-): Promise<ApiResult<{ token: string; user_id: string; team_id: string; email: string }>> {
+): Promise<ApiResult<{ token: string; user_id: string; team_id: string; email: string; name: string }>> {
 	return apiFetch('POST', '/api/v1/auth/switch-team', { team_id: teamId });
 }