feat: add roadmap CRUD module to CMS

New endpoints under /v1/landing/cms:
- GET /roadmap — public, paginated list
- GET /roadmap/detail/{id} — public, detail
- POST /roadmap/vote/{id} — public, increment votes
- POST /roadmap/create — protected (Administrator)
- PATCH /roadmap/update/{id} — protected (Administrator)
- DELETE /roadmap/delete/{id} — protected (Administrator)

Table: roadmap_items (id, title, description, status, votes, is_deleted, created_at, updated_at)
Status values: upcoming, in_progress, completed

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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

@@ -3,6 +3,7 @@ pub mod enum_impls;
 pub mod enums;
 pub mod events;
 pub mod rate_limit;
+pub mod roadmap_items;
 pub mod testimonials;
 pub mod types;
 pub mod utils;

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

@@ -0,0 +1,37 @@
+use chrono::{DateTime, Utc};
+use sea_orm::entity::prelude::*;
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+#[derive(Clone, Debug, PartialEq, DeriveEntityModel, Serialize, Deserialize)]
+#[sea_orm(table_name = "roadmap_items")]
+pub struct Model {
+	#[sea_orm(primary_key, default = "gen_random_uuid()", auto_increment = false)]
+	pub id: Uuid,
+
+	#[sea_orm(not_null)]
+	pub title: String,
+
+	#[sea_orm(not_null)]
+	pub description: String,
+
+	#[sea_orm(not_null, default = "'upcoming'")]
+	pub status: String,
+
+	#[sea_orm(not_null, default = "0")]
+	pub votes: i32,
+
+	#[sea_orm(default = "false")]
+	pub is_deleted: bool,
+
+	#[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 {}