Major refactor: Consolidate DSS into unified package structure

- Create new dss/ Python package at project root
- Move MCP core from tools/dss_mcp/ to dss/mcp/
- Move storage layer from tools/storage/ to dss/storage/
- Move domain logic from dss-mvp1/dss/ to dss/
- Move services from tools/api/services/ to dss/services/
- Move API server to apps/api/
- Move CLI to apps/cli/
- Move Storybook assets to storybook/
- Create unified dss/__init__.py with comprehensive exports
- Merge configuration into dss/settings.py (Pydantic-based)
- Create pyproject.toml for proper package management
- Update startup scripts for new paths
- Remove old tools/ and dss-mvp1/ directories

Architecture changes:
- DSS is now MCP-first with 40+ tools for Claude Code
- Clean imports: from dss import Projects, Components, FigmaToolSuite
- No more sys.path.insert() hacking
- apps/ contains thin application wrappers (API, CLI)
- Single unified Python package for all DSS logic

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/cli/scripts/postinstall.js

@@ -0,0 +1,74 @@
+#!/usr/bin/env node
+/**
+ * DSS Postinstall Script
+ *
+ * Sets up Python virtual environment and installs dependencies
+ * after npm install.
+ */
+
+import { spawn, execSync } from 'child_process';
+import { existsSync, mkdirSync } from 'fs';
+import { join, dirname } from 'path';
+import { fileURLToPath } from 'url';
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const pythonDir = join(__dirname, '..', 'python');
+const venvDir = join(pythonDir, 'venv');
+const apiDir = join(pythonDir, 'api');
+
+console.log('[DSS] Setting up Python environment...');
+
+// Check if Python 3 is available
+function getPythonCmd() {
+  const commands = ['python3', 'python'];
+  for (const cmd of commands) {
+    try {
+      execSync(`${cmd} --version`, { stdio: 'ignore' });
+      return cmd;
+    } catch {
+      continue;
+    }
+  }
+  return null;
+}
+
+const python = getPythonCmd();
+
+if (!python) {
+  console.error('[DSS] Error: Python 3 is required but not found.');
+  console.error('[DSS] Please install Python 3.8+ and try again.');
+  process.exit(1);
+}
+
+console.log(`[DSS] Using ${python}`);
+
+// Create virtual environment if needed
+if (!existsSync(venvDir)) {
+  console.log('[DSS] Creating virtual environment...');
+  try {
+    execSync(`${python} -m venv ${venvDir}`, { stdio: 'inherit' });
+  } catch (error) {
+    console.error('[DSS] Failed to create virtual environment');
+    console.error('[DSS] Try: pip install virtualenv');
+    process.exit(1);
+  }
+}
+
+// Install requirements
+const pip = join(venvDir, 'bin', 'pip');
+const requirements = join(apiDir, 'requirements.txt');
+
+if (existsSync(requirements)) {
+  console.log('[DSS] Installing Python dependencies...');
+  try {
+    execSync(`${pip} install -q -r ${requirements}`, { stdio: 'inherit' });
+    console.log('[DSS] Python environment ready!');
+  } catch (error) {
+    console.error('[DSS] Failed to install Python dependencies');
+    process.exit(1);
+  }
+} else {
+  console.log('[DSS] No requirements.txt found, skipping dependency install');
+}
+
+console.log('[DSS] Setup complete!');