feat(investments): productize and feature-gate Blend and CETES

[Richiey1]

This PR productizes the Blend and CETES investment services and implements feature gating.

Key Changes:

• Backend:
  • Added flag in .
  • Created routes to handle DeFi interactions.
  • Updated to feature-gate CETES and Blend routes based on the configuration.
  • Enhanced endpoint to report active features.
• Frontend (Mobile):
  • Updated page to dynamically check feature availability.
  • Redesigned investment cards with a 'Coming Soon' state when disabled.
  • Improved product copy and integrated navigation to and .

Closes #86

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