fix: restore complete source code and fix launchers

- Copy complete source code packages from original CodeNomad project
- Add root package.json with npm workspace configuration
- Include electron-app, server, ui, tauri-app, and opencode-config packages
- Fix Launch-Windows.bat and Launch-Dev-Windows.bat to work with correct npm scripts
- Fix Launch-Unix.sh to work with correct npm scripts
- Launchers now correctly call npm run dev:electron which launches Electron app

packages/server/src/storage/instance-store.ts

@@ -0,0 +1,64 @@
+import fs from "fs"
+import { promises as fsp } from "fs"
+import os from "os"
+import path from "path"
+import type { InstanceData } from "../api-types"
+
+const DEFAULT_INSTANCE_DATA: InstanceData = {
+  messageHistory: [],
+  agentModelSelections: {},
+}
+
+export class InstanceStore {
+  private readonly instancesDir: string
+
+  constructor(baseDir = path.join(os.homedir(), ".config", "codenomad", "instances")) {
+    this.instancesDir = baseDir
+    fs.mkdirSync(this.instancesDir, { recursive: true })
+  }
+
+  async read(id: string): Promise<InstanceData> {
+    try {
+      const filePath = this.resolvePath(id)
+      const content = await fsp.readFile(filePath, "utf-8")
+      const parsed = JSON.parse(content)
+      return { ...DEFAULT_INSTANCE_DATA, ...parsed }
+    } catch (error) {
+      if ((error as NodeJS.ErrnoException).code === "ENOENT") {
+        return DEFAULT_INSTANCE_DATA
+      }
+      throw error
+    }
+  }
+
+  async write(id: string, data: InstanceData): Promise<void> {
+    const filePath = this.resolvePath(id)
+    await fsp.mkdir(path.dirname(filePath), { recursive: true })
+    await fsp.writeFile(filePath, JSON.stringify(data, null, 2), "utf-8")
+  }
+
+  async delete(id: string): Promise<void> {
+    try {
+      const filePath = this.resolvePath(id)
+      await fsp.unlink(filePath)
+    } catch (error) {
+      if ((error as NodeJS.ErrnoException).code !== "ENOENT") {
+        throw error
+      }
+    }
+  }
+
+  private resolvePath(id: string): string {
+    const filename = this.sanitizeId(id)
+    return path.join(this.instancesDir, `${filename}.json`)
+  }
+
+  private sanitizeId(id: string): string {
+    return id
+      .replace(/[\\/]/g, "_")
+      .replace(/[^a-zA-Z0-9_.-]/g, "_")
+      .replace(/_{2,}/g, "_")
+      .replace(/^_|_$/g, "")
+      .toLowerCase()
+  }
+}