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>

clients/tui/src/components/tabsConfig.ts

@@ -0,0 +1,20 @@
+export type TabType =
+  | "info"
+  | "auth"
+  | "resources"
+  | "prompts"
+  | "tools"
+  | "messages"
+  | "requests"
+  | "logging";
+
+export const tabs: { id: TabType; label: string; accelerator: string }[] = [
+  { id: "info", label: "Info", accelerator: "i" },
+  { id: "auth", label: "Auth", accelerator: "a" },
+  { id: "resources", label: "Resources", accelerator: "r" },
+  { id: "prompts", label: "Prompts", accelerator: "p" },
+  { id: "tools", label: "Tools", accelerator: "t" },
+  { id: "messages", label: "Messages", accelerator: "m" },
+  { id: "requests", label: "HTTP Requests", accelerator: "h" },
+  { id: "logging", label: "Logging", accelerator: "l" },
+];