chore(app): remove obsolete watchlist configuration and adjust navigation

[TNT-Likely]

Background

The portfolio should remain the primary destination after Home. Putting the assistant second gave it more navigation priority than intended.

The repository also retained a YAML example watchlist and unused loaders from an older configuration path. Current application execution reads stocks and Agent bindings from the database.

Changes

• Order primary navigation as Home, Portfolio, Assistant, Opportunities, and Paper Trading.
• Apply the order through the shared navigation definition used by desktop and mobile.
• Delete config/watchlist.yaml and the unused load_watchlist/load_config helpers, along with their unused imports.
• Retain VERSION, which is consumed by the version API and written during Docker builds.

Validation

• cd frontend && pnpm exec vitest run: 177 passed across 41 files.
• cd frontend && pnpm run check:i18n: passed for 126 migrated files.
• cd frontend && pnpm run build: TypeScript and Vite build passed.
• git diff --check: passed.
• Inspected both desktop and mobile consumers of the shared primary navigation array.
• pytest tests/ -x -q -rs through the isolated temporary SQLite wrapper: 885 passed, 3 skipped after configuration cleanup.
• pytest packages/marketdata/tests -q: 188 passed.
• pytest packages/pan-agent-runtime/tests -q: 43 passed.
• Repository reference search confirms the removed loaders had no callers and the active server watchlist path reads the database.

Boundaries and risks

• This changes primary navigation ordering and removes an unused repository configuration path. Physical-device visual acceptance is pending.
• The existing local Node engine and Vite chunk-size warnings remain.
• Local backend skips cover an unavailable optional OpenTelemetry SDK and two Windows-only checks.

Follow-up

• Include navigation and configuration cleanup in the prepared 0.17.0 release.