fix: resolve zod v4 peer dep conflict in @repo/payments via npm overrides

[mauriantolin]

Summary

Fixes #743

@repo/payments uses zod@^4.3.6, but @stripe/agent-toolkit@0.9.0 pulls in openai@4.x which declares peerOptional zod@"^3.23.8". npm v7+ fails with ERESOLVE even for optional peer deps when an incompatible version is already installed — blocking npx next-forge@latest init for npm users.

Root Cause

The dependency chain:

@repo/payments → @stripe/agent-toolkit@^0.9.0
                       → openai@^4.86.1 (peerOptional zod@"^3.23.8")
@repo/payments → zod@^4.3.6  ← conflicts with openai's peer dep range

Fix

Added a targeted overrides entry in the root package.json (which already contains an overrides block for parse5):

"overrides": {
  "parse5": "^7.2.1",
  "openai": {
    "zod": "^4.3.6"
  }
}

This tells npm's resolver to use zod@^4.3.6 when resolving openai's peer dep, eliminating the ERESOLVE error without disabling peer dep validation globally.

Test plan

• Run npx next-forge@latest init with npm on Windows — npm install should complete without ERESOLVE errors
• Verify bun install is unaffected (bun ignores npm overrides)

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