feat: port CLI, TUI, and launcher from v1.5 into v2 (#1452)

Ports the CLI, TUI, and launcher from v1.5 into v2 behind a single
`mcp-inspector` entrypoint (launcher → web/cli/tui). Includes the
`mcp-inspector --web --dev` launcher fix (Vite alias resolution + prod-server
double-start), the root `postinstall` install cascade with simplified CI, and
spec/AGENTS docs (no-workspaces rationale, Development setup).

Closes #1246.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

core/tsconfig.json

@@ -0,0 +1,16 @@
+{
+  "extends": "../tsconfig.base.json",
+  "compilerOptions": {
+    "noEmit": true,
+    "types": ["node"],
+    "typeRoots": ["../clients/web/node_modules/@types"]
+  },
+  "include": [
+    "mcp/**/*.ts",
+    "storage/**/*.ts",
+    "auth/**/*.ts",
+    "json/**/*.ts",
+    "logging/**/*.ts"
+  ],
+  "exclude": ["node_modules", "**/__tests__/**", "react/**"]
+}