feat(bladw_warn): add warning system configuration

Create initial configuration file for the warning system with:
- Predefined warning reasons (RDM, VDM, RP violations, etc.)
- Chat announcement settings (enabled by default, scoped to target)
- Staff group definitions for permission levels

lua/bladw_warn/shared/sh_config.lua

@@ -0,0 +1,29 @@
+BladW = BladW or {}
+BladW.Warn = BladW.Warn or {}
+BladW.Warn.Conf = BladW.Warn.Conf or {}
+
+-- config des warns
+BladW.Warn.Conf = {
+    -- les raisons proposées dans le menu déroulant du modal
+    reasons = {
+        "RDM",
+        "VDM",
+        "No Fear RP",
+        "Fail RP",
+        "Troll",
+        "Metagaming",
+        "Powergaming",
+        "Propos déplacés / insultes",
+        "Non-respect du staff",
+        "Publicité",
+        "Bug abuse",
+    },
+
+    -- annonce le warn dans le chat de base
+    chat_announce = true,
+    -- à qui : "all" (tout le monde) | "target" (juste l'averti) | "staff" (les admins)
+    chat_scope = "target",
+
+    -- groupes considérés comme "staff" (affiche le bouclier). IsAdmin() est toujours staff.
+    staff_groups = { "superadmin", "admin", "moderator", "modo", "helper", "support" },
+}