Proxy-based config loses TypeScript safety

[DeFiVC]

Problem

In src/config/index.ts lines 90-94, the config export uses a Proxy that returns (ensureConfig() as any)[prop]. Any property access on config returns any, bypassing TypeScript's type checking.

If someone writes config.NONEXISTENT_KEY, it compiles fine but returns undefined at runtime.

Fix

Consider eagerly loading config at startup (with the test-mode fallback) instead of using a Proxy, to preserve type safety.

Scope

• src/config/index.ts -- refactor config loading

Acceptance Criteria

1. Config properties are type-checked at compile time
2. Typo in config property name causes compile error
3. Existing tests pass

Technical Context

• src/config/index.ts:90-94 -- Proxy-based config