feat(ai): enhance session management, inquirer theme, and gRPC MCP support

- AI & Session Management:
  - Add random suffix to session IDs to ensure uniqueness.
  - Implement optional pagination/limit in session listing (default 20).
  - Add `--all` flag to `ai` CLI commands to view all sessions.
  - Keep active session ID and path synced correctly during clean session startups.

- CLI UI/UX:
  - Add a custom `ConnpyTheme` for inquirer prompts that dynamically translates
    active hex style colors to terminal ANSI/blessed escapes.

- gRPC & Services:
  - Implement remote MCP server listing (`list_mcp_servers` RPC and services).
  - Stream responder updates (`__RESPONDER__`) to toggle headers dynamically between
    "Network Engineer" and "Network Architect" on remote/web clients.
  - Fix remote client deadlock risk by ensuring `final_mark` is sent on exceptions.
  - Hydrate client-side chat history correctly on initial streaming request.

- Testing:
  - Add integration tests for AI gRPC services and MCP server listing.

connpy/connapp.py

@@ -281,6 +281,7 @@ class connapp:
         aiparser.add_argument("--debug", action="store_true", help="Show AI reasoning and tool calls")
         aiparser.add_argument("-y", "--trust", action="store_true", help="Trust AI to execute unsafe commands without confirmation")
         aiparser.add_argument("--list", "--list-sessions", dest="list_sessions", action="store_true", help="List saved AI sessions")
+        aiparser.add_argument("--all", action="store_true", help="Show all sessions without limit")
         aiparser.add_argument("--session", nargs=1, help="Resume a specific AI session by ID")
         aiparser.add_argument("--resume", action="store_true", help="Resume the most recent AI session")
         aiparser.add_argument("--delete", "--delete-session", dest="delete_session", nargs=1, help="Delete an AI session by ID")