refactor(orders): simplify request parsing and stock check

[timo9378]

Demo PR: an innocuous-looking "simplification" that actually removes the JSON parse guard (and its 400 path) and weakens the stock check. This is exactly the class of change the Route Flow Diff action should surface — verifying the action end-to-end on a real PR.

🤖 Generated with Claude Code

[github-actions]

🔬 Route flow diff

examples/api/orders/route.ts — POST /api/handler

0 added · 2 removed · 2 modified · 18 unchanged · confidence 95%

• ⚠️ 🔴 Error handling removed: Try / Catch
• ⚠️ 🔴 Error response path removed: Response 400
• 🟡 ✏️ Branch condition changed: !product || product.stock < quantity → !product
• ▫️ ✏️ Modified: req.json

🆕 New audit warnings introduced:

• [warning] Async operation "req.json" has no error handling (missing try/catch) (line 19)
• [warning] Async operation "db.product.findUnique" has no error handling (missing try/catch) (line 31)
• [warning] Async operation "order" has no error handling (missing try/catch) (line 46)

Flow graph (after — 🟢 added, 🟠 modified)

flowchart TD
  trigger_1(["POST /api/handler"])
  transform_1["ip"]
  async_op_1["rateLimit.limit"]
  if_1{"if !success"}
  response_1[/"Response 429"/]
  async_op_2["req.json"]
  transform_2["parsed"]
  if_2{"if !parsed.success"}
  response_2[/"Response 422"/]
  transform_3["productId, quantity, couponCode"]
  async_op_3["db.product.findUnique"]
  if_3{"if !product"}
  response_3[/"Response 409"/]
  var_1["discount"]
  if_4{"if couponCode"}
  async_op_4["db.coupon.findUnique"]
  if_5{"if coupon && coupon.expiresAt > new Date"}
  transform_4["total"]
  async_op_5["order"]
  response_4[/"Response 201"/]
  transform_1 --> async_op_1
  transform_2 --> if_2
  transform_2 --> response_2
  transform_2 --> transform_3
  async_op_3 --> if_3
  async_op_4 --> if_5
  async_op_3 --> transform_4
  var_1 --> transform_4
  async_op_3 --> async_op_5
  transform_4 --> async_op_5
  async_op_5 --> response_4
  transform_4 --> response_4
  if_1 --> response_1
  if_2 --> response_2
  if_3 --> response_3
  if_4 --> async_op_4
  trigger_1 --> transform_1
  async_op_1 --> if_1
  if_1 --> async_op_2
  async_op_2 --> transform_2
  transform_3 --> async_op_3
  if_3 --> var_1
  var_1 --> if_4
  classDef added fill:#16a34a,stroke:#166534,color:#ffffff
  classDef modified fill:#d97706,stroke:#92400e,color:#ffffff
  class if_3,async_op_2 modified

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_{Generated by flow2code — semantic flow diff for TypeScript API routes.}