dashboard: add upstream account filters

[mxyhi]

Summary

• merge upstream filter options by upstream id instead of splitting by provider format
• add linked account filter with all/public/account choices for dashboard and logs
• extend dashboard snapshot query and tests for upstream/account/public filtering

Verification

• cargo fmt --all --check
• cargo check --workspace
• cargo test --workspace
• pnpm vitest run src/features/dashboard/api.test.ts src/features/dashboard/snapshot.test.tsx src/features/dashboard/DashboardPanel.test.tsx src/features/logs/LogsPanel.test.tsx
• pnpm build