Feat: Hybrid Architecture Phase 1

- Implemented Game Server (game-server.js) with Socket.io
- Added JSON Schemas for Campaigns and Missions
- Updated Docker configurations for multi-service setup
- Refactored main.js to allow local network connections
- Removed legacy code (main_old.js)
- Updated dependencies

src/schemas/CampaignSchema.js

@@ -0,0 +1,51 @@
+/**
+ * @typedef {Object} LootTableEntry
+ * @property {string} itemId - ID of the item
+ * @property {number} weight - Probability weight
+ * @property {number} [minLevel] - Minimum level required
+ */
+
+/**
+ * @typedef {Object} CampaignMissionNode
+ * @property {string} id - Unique ID of the mission reference
+ * @property {string} missionId - ID of the mission template to use
+ * @property {string} title - Display title for this step
+ * @property {string[]} [next] - IDs of potential next missions (for branching)
+ * @property {Object} [requirements] - Requirements to unlock
+ */
+
+/**
+ * @typedef {Object} Campaign
+ * @property {string} id - Unique Campaign ID
+ * @property {string} title - Display Title
+ * @property {string} description - Brief description
+ * @property {string} author - Author name
+ * @property {string} version - Version string (e.g. "1.0.0")
+ * @property {CampaignMissionNode[]} missions - Graph of missions
+ * @property {Object.<string, LootTableEntry[]>} lootTables - Global loot tables
+ */
+
+export const CampaignSchema = {
+    type: "object",
+    required: ["id", "title", "missions"],
+    properties: {
+        id: { type: "string" },
+        title: { type: "string" },
+        description: { type: "string" },
+        author: { type: "string" },
+        version: { type: "string" },
+        missions: {
+            type: "array",
+            items: {
+                type: "object",
+                required: ["id", "missionId"],
+                properties: {
+                    id: { type: "string" },
+                    missionId: { type: "string" },
+                    title: { type: "string" },
+                    next: { type: "array", items: { type: "string" } }
+                }
+            }
+        }
+    }
+};