(Feat) Add Build

Assets/GAME/Script/Building/BuildableData.cs

@@ -3,6 +3,25 @@ using Ashwild.Inventory;
 
 namespace Ashwild.Building
 {
+    /// <summary>
+    /// What a buildable is allowed to rest on. This is the one placement rule that genuinely differs
+    /// per structure — a foundation sits on terrain, a wall or a ceiling only makes sense attached to
+    /// something — so it is authored here rather than configured globally on BuildManager (which keeps
+    /// owning the project-wide layer masks: what blocks a build does not vary per build).
+    ///
+    /// <see cref="GroundOrSnap"/> is deliberately the zero value: Unity deserializes a missing field to
+    /// 0, so buildables authored before this rule existed keep their old, permissive behaviour instead
+    /// of silently becoming unplaceable.
+    /// </summary>
+    public enum PlacementSupport
+    {
+        /// <summary>Free placement anywhere the aim lands, or connected to a socket. Foundations, floors.</summary>
+        GroundOrSnap,
+
+        /// <summary>Only valid while connected to a matching socket. Walls, ceilings, roofs.</summary>
+        SnapOnly
+    }
+
     /// <summary>
     /// Authoring data for one buildable structure shown in the construction menu (a wall, a
     /// floor, a door, ...). Mirrors the ScriptableObject-for-data / MonoBehaviour-for-logic
@@ -35,6 +54,14 @@ namespace Ashwild.Building
         [Tooltip("Resources consumed from the builder's inventory on each placement. Leave empty for a free build.")]
         [SerializeField] private BuildCost[] cost;
 
+        [Header("Placement")]
+        [Tooltip("Where this structure may be committed. Walls, ceilings and roofs should be Snap Only so they cannot be dropped in mid-air; foundations and floors stay Ground Or Snap.")]
+        [SerializeField] private PlacementSupport support = PlacementSupport.GroundOrSnap;
+
+        [Header("Health")]
+        [Tooltip("Hit points the placed structure starts with. Damage subtracts from this (server-authoritative in BuildRegistry); at 0 the build is destroyed. A manual demolition refunds the cost in proportion to the health left.")]
+        [SerializeField] private float maxHealth = 100f;
+
         #endregion
 
         #region Public API
@@ -45,6 +72,8 @@ namespace Ashwild.Building
         public GameObject GhostPrefab => ghostPrefab;
         public GameObject BuiltPrefab => builtPrefab;
         public BuildCost[] Cost => cost;
+        public float MaxHealth => maxHealth;
+        public PlacementSupport Support => support;
 
         /// <summary>
         /// Whether the given inventory holds enough of every cost line to place this structure once.