Investment dashboard: JWT user resolution + controller/test alignment

What this MR changes

• Enables dashboard endpoints to resolve investor identity directly from JWT bearer tokens.
• Passes Authorization header from controller layer into the dashboard user resolver.
• Preserves local/test developer workflow through userId query parameter fallback.

Why

• Removes dependency on explicit userId query params in authenticated flows.
• Aligns dashboard behavior with project-wide JWT-based authentication.
• Improves reliability across gateway and frontend integration paths.

Validation

• Added/updated unit tests for resolver and dashboard controller.
• Verified targeted tests pass successfully.