fix(login): request-otp must insert otp_code (NOT NULL) for send_pin email

Full edge-fn sync clobbered a live hotfix: repo request-otp only wrote
otp_code_hash, but login_otps.otp_code is NOT NULL, so every request
failed with 'Failed to generate OTP' and no PIN email was sent. Restore
writing otp_code (n8n send_pin trigger emails it; verify still uses hash).

supabase/functions/request-otp/index.ts

@@ -89,11 +89,14 @@ Deno.serve(async (request) => {
     const clientIp = getClientIp(request);
     const userAgent = request.headers.get("user-agent") || null;
 
-    // Insert with OTP hash only — no plaintext in DB
+    // Insert with OTP hash for verification. otp_code (plaintext) is also stored
+    // because DB has it NOT NULL and the send_pin trigger (→ n8n webhook) emails
+    // this exact code to the user. verify-otp still compares the SHA-256 hash.
     const { error: insertError } = await supabase.from("login_otps").insert({
       email,
       name: userName,
       role: userRole,
+      otp_code: otp,
       otp_code_hash: otpCodeHash,
       ip_address: clientIp,
       user_agent: userAgent,