chore: isolate shared dsh plugins into independent monorepo

tsconfig.base.json

@@ -0,0 +1,29 @@
+{
+  // Isolation build base for dsh-plugins packages. No `paths` and no
+  // include/files: resolution goes through node_modules of the published
+  // @deepseek-ai/* core packages, never a repo-local source graph.
+  "compilerOptions": {
+    "target": "es2024",
+    "module": "esnext",
+    "moduleResolution": "bundler",
+    "lib": ["es2024", "dom"],
+    "declaration": true,
+    "sourceMap": true,
+    "declarationMap": true,
+    "composite": true,
+    "incremental": true,
+    "skipLibCheck": true,
+    "esModuleInterop": true,
+    "allowImportingTsExtensions": true,
+    "rewriteRelativeImportExtensions": true,
+    "verbatimModuleSyntax": false,
+    "strict": true,
+    "noUncheckedIndexedAccess": true,
+    "exactOptionalPropertyTypes": true,
+    "noImplicitOverride": true,
+    "noFallthroughCasesInSwitch": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "types": ["node"]
+  }
+}