feat(dimentorin): payment module - gateway-agnostic VA/QRIS with admin confirm

- app_payments table + PaymentEntity (amount from mentor mentoring_rate + service fee 2000)
- PaymentRepository (postgres) + PaymentServiceImpl (create/get/confirm/list)
- Routes: POST /payments/sessions/{id}/create, GET /payments/me, GET /payments/{id}, POST /payments/{id}/confirm
- confirm guarded by Admin/Admin Pembayaran role; ownership guard mentee-only view
- provider=manual default (swap midtrans/xendit later), e2e verified: VA+QRIS create, confirm 200, re-confirm 409, non-admin 403, foreign payment 403

imphnen-entities/src/seaorm/common/mod.rs

@@ -4,6 +4,7 @@ pub mod enum_impls;
 pub mod enums;
 pub mod events;
 pub mod otp_cache;
+pub mod payments;
 pub mod rate_limit;
 pub mod roadmap_items;
 pub mod testimonials;

imphnen-entities/src/seaorm/common/payments.rs

@@ -0,0 +1,62 @@
+use chrono::{DateTime, Utc};
+use sea_orm::entity::prelude::*;
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize, DeriveEntityModel)]
+#[sea_orm(table_name = "app_payments")]
+pub struct Model {
+	#[sea_orm(primary_key, default = "gen_random_uuid()", auto_increment = false)]
+	pub id: Uuid,
+
+	#[sea_orm(column_type = "Uuid")]
+	pub session_id: Uuid,
+
+	#[sea_orm(column_type = "Uuid")]
+	pub mentee_id: Uuid,
+
+	#[sea_orm(column_type = "Uuid")]
+	pub mentor_id: Uuid,
+
+	#[sea_orm(column_type = "BigInteger", default = 0)]
+	pub amount: i64,
+
+	#[sea_orm(column_type = "BigInteger", default = 0)]
+	pub service_fee: i64,
+
+	#[sea_orm(column_type = "BigInteger", default = 0)]
+	pub total: i64,
+
+	// payment method: "va" | "qris" | "manual"
+	#[sea_orm(default = "manual")]
+	pub method: String,
+
+	// payment provider: "manual" | "midtrans" | "xendit" (swap later)
+	#[sea_orm(default = "manual")]
+	pub provider: String,
+
+	// status: "pending" | "paid" | "expired" | "cancelled"
+	#[sea_orm(default = "pending")]
+	pub status: String,
+
+	// provider reference: VA number / QR string / external transaction id
+	#[sea_orm(nullable)]
+	pub external_ref: Option<String>,
+
+	#[sea_orm(nullable)]
+	pub paid_at: Option<DateTime<Utc>>,
+
+	#[sea_orm(not_null)]
+	pub expires_at: DateTime<Utc>,
+
+	#[sea_orm(not_null, default = "now()")]
+	pub created_at: DateTime<Utc>,
+
+	#[sea_orm(not_null, default = "now()")]
+	pub updated_at: DateTime<Utc>,
+}
+
+#[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
+pub enum Relation {}
+
+impl ActiveModelBehavior for ActiveModel {}