chore: reorganize repo — legacy packages to legacy-packages/, templates to examples/

- Move 15 old workflow-* packages to legacy-packages/ (inactive, preserved for reference)
- Rename templates/ → examples/ for clarity
- Rewrite docs/architecture.md to reflect current uwf architecture
- Active packages remain in packages/: cli-uwf, uwf-agent-hermes, uwf-agent-kit, uwf-moderator, uwf-protocol, workflow-util

小橘 🍊（NEKO Team）

packages/cli-workflow/package.json

@@ -1,30 +0,0 @@
-{
-  "name": "@uncaged/cli-workflow",
-  "version": "0.5.0-alpha.4",
-  "files": [
-    "src",
-    "dist",
-    "package.json"
-  ],
-  "type": "module",
-  "bin": {
-    "uncaged-workflow": "src/cli.ts"
-  },
-  "dependencies": {
-    "@uncaged/workflow-gateway": "workspace:^",
-    "@uncaged/workflow-protocol": "workspace:^",
-    "@uncaged/workflow-util": "workspace:^",
-    "@uncaged/workflow-cas": "workspace:^",
-    "@uncaged/workflow-execute": "workspace:^",
-    "@uncaged/workflow-register": "workspace:^",
-    "@uncaged/workflow-runtime": "workspace:^",
-    "hono": "^4.12.18",
-    "yaml": "^2.8.4"
-  },
-  "scripts": {
-    "test": "bun test"
-  },
-  "publishConfig": {
-    "access": "public"
-  }
-}