feat: Add canvas snapshots to save and restore full canvas state

Implements save/restore system that captures HTML base, injected CSS,
executed scripts, and floating Vue windows with their full definitions.
Adds 4 MCP tools, backend CRUD API, Pinia store, and script logger.

server/routes/index.ts

@@ -10,6 +10,7 @@ import { handleTables, handleStats, handleTableSchema, handleTableData, handleQu
 import { handleWhisperRoutes } from './whisper'
 import { handleRecordingsRoutes } from './recordings'
 import { handleClaudeStatus } from './claude-status'
+import { handleSnapshots, handleSnapshotById } from './snapshots'
 import { handleGitStatus, handleGitDiff, handleGitLog, handleGitLogCommit, handleGitCompare, handleGitBranches, handleGitCurrentBranch, handleGitTree, handleGitFile } from './git'
 
 export async function handleRequest(req: Request): Promise<Response> {
@@ -145,6 +146,18 @@ export async function handleRequest(req: Request): Promise<Response> {
     if (res) return res
   }
 
+  // Snapshots
+  if (path === '/api/snapshots') {
+    const res = await handleSnapshots(req)
+    if (res) return res
+  }
+
+  if (path.startsWith('/api/snapshots/')) {
+    const id = path.split('/').pop()!
+    const res = await handleSnapshotById(req, id)
+    if (res) return res
+  }
+
   // Gitea
   if (path === '/api/gitea/repo' && req.method === 'POST') {
     return handleGiteaRepo(req)