feat(sproutclaw): modularize webui, extensions, and agent config layout

Restructure local extensions into per-feature directories, split WebUI
into backend modules with slash commands and systemd support, and track
prompts/skills under .pi/agent for portable Gitea deployment.

Co-authored-by: Cursor <cursoragent@cursor.com>

.pi/agent/extensions/webui/frontend/package-lock.json

@@ -15,6 +15,7 @@
         "react-router-dom": "7.15.1"
       },
       "devDependencies": {
+        "@mogeko/maple-mono-cn": "7.9.0",
         "@types/react": "19.2.15",
         "@types/react-dom": "19.2.3",
         "@vitejs/plugin-react": "4.7.0",
@@ -72,7 +73,6 @@
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       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@babel/code-frame": "^7.29.0",
         "@babel/generator": "^7.29.0",
@@ -2630,6 +2630,13 @@
         "@jridgewell/sourcemap-codec": "^1.4.14"
       }
     },
+    "node_modules/@mogeko/maple-mono-cn": {
+      "version": "7.9.0",
+      "resolved": "https://registry.npmjs.org/@mogeko/maple-mono-cn/-/maple-mono-cn-7.9.0.tgz",
+      "integrity": "sha512-NZls63+8Q4+17saZqhN5sFB9UqIfyI73q+NNyXNQFmdzivzSYAKLCuo2yvheyEm95kuH8VEhwTl4YvbMoqIbFw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@rolldown/pluginutils": {
       "version": "1.0.0-beta.27",
       "resolved": "https://registry.npmjs.org/@rolldown/pluginutils/-/pluginutils-1.0.0-beta.27.tgz",
@@ -3181,7 +3188,6 @@
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       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "csstype": "^3.2.2"
       }
@@ -3250,7 +3256,6 @@
       "integrity": "sha512-Thbli+OlOj+iMPYFBVBfJ3OmCAnaSyNn4M1vz9T6Gka5Jt9ba/HIR56joy65tY6kx/FCF5VXNB819Y7/GUrBGA==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "fast-deep-equal": "^3.1.3",
         "fast-uri": "^3.0.1",
@@ -3442,7 +3447,6 @@
         }
       ],
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "baseline-browser-mapping": "^2.10.12",
         "caniuse-lite": "^1.0.30001782",
@@ -5292,7 +5296,6 @@
       "resolved": "https://registry.npmjs.org/react/-/react-19.2.6.tgz",
       "integrity": "sha512-sfWGGfavi0xr8Pg0sVsyHMAOziVYKgPLNrS7ig+ivMNb3wbCBw3KxtflsGBAwD3gYQlE/AEZsTLgToRrSCjb0Q==",
       "license": "MIT",
-      "peer": true,
       "engines": {
         "node": ">=0.10.0"
       }
@@ -5302,7 +5305,6 @@
       "resolved": "https://registry.npmjs.org/react-dom/-/react-dom-19.2.6.tgz",
       "integrity": "sha512-0prMI+hvBbPjsWnxDLxlCGyM8PN6UuWjEUCYmZhO67xIV9Xasa/r/vDnq+Xyq4Lo27g8QSbO5YzARu0D1Sps3g==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "scheduler": "^0.27.0"
       },
@@ -6072,7 +6074,6 @@
       "integrity": "sha512-tPbLXTI6ohPASb/1YViL428oEHu6/qv1OxqYnfaonVCFHqx4+wCd95pHrQWsL5X4pl90CTyW9piSAsS2L0VoMw==",
       "dev": true,
       "license": "BSD-2-Clause",
-      "peer": true,
       "dependencies": {
         "@jridgewell/source-map": "^0.3.3",
         "acorn": "^8.15.0",
@@ -6360,7 +6361,6 @@
       "integrity": "sha512-2N/55r4JDJ4gdrCvGgINMy+HH3iRpNIz8K6SFwVsA+JbQScLiC+clmAxBgwiSPgcG9U15QmvqCGWzMbqda5zGQ==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "esbuild": "^0.25.0",
         "fdir": "^6.4.4",