[0.85] fix(ios): load RCTDefines.h first in React umbrella + drop submodule wildcard so RCT_* macros stay visible

[wneel]

Target Branch

0.85

Link to commit or PR to be picked

facebook/react-native#56862

Description

Same regression as the #1305 (0.84 pick): the new RCT_USE_PREBUILT_RNCORE=1 default plus use_frameworks! causes RCTDefines.h macros (RCT_EXTERN, RCT_EXPORT_METHOD, etc.) to be scoped to a sibling submodule and not propagate to consumers. Any pod relying on those macros (React Native Firebase: Auth, Storage, Messaging, Firestore) fails to compile under use_frameworks! on 0.85.

Fix reorders the React umbrella so RCTDefines.h is first and drops the module * { export * } wildcard in the modulemap, collapsing the React module into a single parse context. 2 files changed, 5 lines net.

---

• Impact: broad (Firebase on iOS via use_frameworks!, tracked at [🐛] compile errors with react-native CLI + pre-compiled iOS distribution default on RN 0.84 - workaround - disable pre-compiled react-native or use Podfile preinstall hook invertase/react-native-firebase#8883).
  Critical developer workflow: yes.
• Regression vs. 0.83: yes (prebuilt RNCore default flipped in 0.84 and the issue persists in 0.85).
• Risk: low. Confined to iOS prebuild templates; CI green; no behavior change for non-use_frameworks! users.

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