feat(payment): standalone ZarinPal broker on pay.flatrender.ir

A generic multi-client payment gateway so FlatRender, meezi.ir and
bargevasat.ir can all pay through ZarinPal's single verified callback
domain (pay.flatrender.ir).

New Go service services/payment (clones the notification skeleton +
vendored deps):
- migration 31_payment_broker.sql — `payment` schema: client_apps,
  transactions, webhook_deliveries.
- ZarinPal v4 client ported from the proven identity PaymentService
  (request.json -> StartPay -> verify.json; codes 100/101).
- client API: POST /v1/pay/request + /v1/pay/inquiry, authed by
  X-Api-Key + HMAC body signature; GET /callback/zarinpal (the single
  verified endpoint) verifies, then 302s the user back to the site's
  return_url (signed) and fires a signed, retried webhook.
- per-client ZarinPal merchant override (default = shared merchant);
  amount stored canonically in Rial, unit to ZarinPal env-configurable.
- admin API /v1/admin/* (FlatRender admin JWT): client-app CRUD +
  key issue/rotate + transactions list.

Deploy wiring: payment-svc in docker-compose.v2.yml (host port 1607),
pay.flatrender.ir server block in mirror-nginx conf, ENV_FILE +
README updates (cert SAN + manual migration note).

Admin UI: src/components/admin/PaymentsAdmin.tsx (client apps with
one-time key reveal + rotate, transactions table) + /admin/payments
page + nav link + fa/en strings; pay-admin proxy route to payment-svc.

Docs/SDK: deploy/PAYMENTS.md (integration contract) + deploy/sdk/flatpay.js
(zero-dep Node client + webhook verifier) for meezi/any site.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

services/payment/vendor/github.com/bytedance/sonic/option/option.go

@@ -0,0 +1,86 @@
+/*
+ * Copyright 2021 ByteDance Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package option
+
+var (
+    // DefaultDecoderBufferSize is the initial buffer size of StreamDecoder
+    DefaultDecoderBufferSize  uint = 128 * 1024
+
+    // DefaultEncoderBufferSize is the initial buffer size of Encoder
+    DefaultEncoderBufferSize  uint = 128 * 1024
+)
+
+// CompileOptions includes all options for encoder or decoder compiler.
+type CompileOptions struct {
+    // the maximum depth for compilation inline
+    MaxInlineDepth int
+
+    // the loop times for recursively pretouch
+    RecursiveDepth int
+}
+
+var (
+    // Default value(3) means the compiler only inline 3 layers of nested struct. 
+    // when the depth exceeds, the compiler will recurse 
+    // and compile subsequent structs when they are decoded 
+    DefaultMaxInlineDepth = 3
+
+    // Default value(1) means `Pretouch()` will be recursively executed once,
+    // if any nested struct is left (depth exceeds MaxInlineDepth)
+    DefaultRecursiveDepth = 1
+)
+
+// DefaultCompileOptions set default compile options.
+func DefaultCompileOptions() CompileOptions {
+    return CompileOptions{
+        RecursiveDepth: DefaultRecursiveDepth,
+        MaxInlineDepth: DefaultMaxInlineDepth,
+    }
+}
+
+// CompileOption is a function used to change DefaultCompileOptions.
+type CompileOption func(o *CompileOptions)
+
+// WithCompileRecursiveDepth sets the loop times of recursive pretouch 
+// in both decoder and encoder,
+// for both concrete type and its pointer type.
+//
+// For deep nested struct (depth exceeds MaxInlineDepth), 
+// try to set more loops to completely compile, 
+// thus reduce JIT unstability in the first hit.
+func WithCompileRecursiveDepth(loop int) CompileOption {
+    return func(o *CompileOptions) {
+            if loop < 0 {
+                panic("loop must be >= 0")
+            }
+            o.RecursiveDepth = loop
+        }
+}
+
+// WithCompileMaxInlineDepth sets the max depth of inline compile 
+// in decoder and encoder.
+//
+// For large nested struct, try to set smaller depth to reduce compiling time.
+func WithCompileMaxInlineDepth(depth int) CompileOption {
+    return func(o *CompileOptions) {
+            if depth <= 0 {
+                panic("depth must be > 0")
+            }
+            o.MaxInlineDepth = depth
+        }
+}
+