feat: 增强代理节点和代理资料管理功能

- 在 AgentNodeProfileController 中添加对父代理能力授予的验证，确保子代理的权限在父代理范围内。
- 更新多个请求类，统一代理资料字段的验证逻辑，提升代码复用性。
- 引入 AgentProfileFieldRules 以简化代理资料更新请求的规则定义。
- 在 AgentProfile 模型中设置主键为 agent_node_id，确保与代理节点的关联性。
- 更新错误信息，增加对授信额度和占成比例的验证，确保数据一致性。

app/Services/Agent/AgentProfileService.php

@@ -6,6 +6,7 @@ use App\Models\AdminUser;
 use App\Models\AgentNode;
 use App\Models\AgentProfile;
 use App\Support\AdminAgentScope;
+use App\Support\AgentSettlementCycle;
 use Illuminate\Support\Facades\DB;
 use Illuminate\Validation\ValidationException;
 
@@ -38,6 +39,12 @@ final class AgentProfileService
             $previousCredit = (int) $profile->credit_limit;
             $isNew = ! $profile->exists;
 
+            if (! $isNew && $creditLimit < (int) $profile->allocated_credit) {
+                throw ValidationException::withMessages([
+                    'credit_limit' => ['below_allocated'],
+                ]);
+            }
+
             if ($parent !== null) {
                 $delta = $isNew ? $creditLimit : max(0, $creditLimit - $previousCredit);
                 if ($delta > 0) {
@@ -56,7 +63,9 @@ final class AgentProfileService
                 'credit_limit' => $creditLimit,
                 'rebate_limit' => $rebateLimit,
                 'default_player_rebate' => $defaultRebate,
-                'settlement_cycle' => (string) ($payload['settlement_cycle'] ?? $profile->settlement_cycle ?? 'weekly'),
+                'settlement_cycle' => AgentSettlementCycle::normalize(
+                    $payload['settlement_cycle'] ?? $profile->settlement_cycle ?? 'weekly',
+                ),
                 'can_grant_extra_rebate' => (bool) ($payload['can_grant_extra_rebate'] ?? $profile->can_grant_extra_rebate ?? false),
                 'can_create_child_agent' => (bool) ($payload['can_create_child_agent'] ?? ($isNew ? false : $profile->can_create_child_agent)),
                 'can_create_player' => (bool) ($payload['can_create_player'] ?? ($isNew ? true : $profile->can_create_player ?? true)),
@@ -98,7 +107,7 @@ final class AgentProfileService
             'available_credit' => $available,
             'rebate_limit' => (float) $profile->rebate_limit,
             'default_player_rebate' => (float) $profile->default_player_rebate,
-            'settlement_cycle' => (string) $profile->settlement_cycle,
+            'settlement_cycle' => AgentSettlementCycle::normalize($profile->settlement_cycle),
             'can_grant_extra_rebate' => (bool) $profile->can_grant_extra_rebate,
             'can_create_child_agent' => (bool) $profile->can_create_child_agent,
             'can_create_player' => (bool) $profile->can_create_player,