docs(developers): add daemon-mode developer deep-dive documentation set

Adds 20-file bilingual (English + Chinese) developer documentation set
under docs/developers/daemon/ for qwen serve daemon mode. Plus one
nav entry in docs/developers/_meta.ts and a sub-nav under
docs/developers/daemon/_meta.ts.

The set complements (not replaces) the existing daemon docs:

  - docs/users/qwen-serve.md  — operator quickstart, flags, threat model
  - docs/developers/qwen-serve-protocol.md — wire-level HTTP routes
  - docs/developers/examples/daemon-client-quickstart.md — TS walkthrough
  - docs/developers/daemon-client-adapters/* — adapter design drafts

It is the developer architecture reference that's been missing — a new
contributor's path through the system, with one architectural diagram
doc and per-component deep-dives in both English and Chinese.

Document set:

  Foundation
  - 00-index.md            navigation, glossary, reading paths
  - 01-architecture.md     system architecture + 6 Mermaid diagrams

  Server core
  - 02-serve-runtime.md    runQwenServe bootstrap, Express, lifecycle,
                           validatePolicyConfig + InvalidPolicyConfigError
  - 03-acp-bridge.md       @qwen-code/acp-bridge package internals
  - 04-permission-mediation.md  MultiClientPermissionMediator — four
                           policies, N=floor(M/2)+1 quorum + M=2 unanimity
                           edge case, X-Qwen-Client-Id self-declaration
                           security caveat
  - 05-mcp-transport-pool.md  McpTransportPool (F2) including pool-aware
                           snapshot fields (entryCount / entrySummary),
                           MCPCallInterruptedError on silent transport
                           drop, canonicalOAuth fingerprint normalization,
                           extension-uninstall orphan reap via MAX_IDLE_MS,
                           IDE-close drain path, /mcp refresh pool gate
  - 06-mcp-budget-guardrails.md  WorkspaceMcpBudget — modes, hysteresis,
                           refused-batch coalescing, scope: 'pool' future
                           reservation
  - 07-workspace-filesystem.md  WorkspaceFileSystem sandbox + FsError
                           preservation over ACP wire
  - 08-session-lifecycle.md  create/attach/load/resume, identity,
                           heartbeat, eviction
  - 09-event-schema.md     typed event schema v1 (29 known event types)
                           with payloads, reducers, envelope-level
                           metadata (_meta.serverTimestamp),
                           tool-call _meta (provenance + serverId),
                           SDK reducer behavior (awaitingResync flag,
                           RESYNC_PASSTHROUGH_TYPES)
  - 10-event-bus.md        EventBus + Last-Event-ID replay +
                           ring-eviction-on-resume state_resync_required
                           recovery flow
  - 11-capabilities-versioning.md  capability registry, protocol version,
                           conditional advertisement
  - 12-auth-security.md    bearer, host allowlist, mutation gate,
                           --require-auth, /health exemption,
                           device-flow, X-Qwen-Client-Id identity caveat,
                           sanitizeForStderr CVE-2021-42574 defense

  Clients
  - 13-sdk-daemon-client.md  TypeScript SDK — DaemonClient,
                           DaemonSessionClient, DaemonAuthFlow, SSE,
                           MCP_RESTART_DEFAULT_TIMEOUT_MS 330s rationale
  - 14-cli-tui-adapter.md  DaemonTuiAdapter
  - 15-channel-adapters.md  DaemonChannelBridge + DingTalk / WeChat /
                           Telegram
  - 16-vscode-ide-adapter.md  DaemonIdeConnection (loopback-only)

  Reference appendices
  - 17-configuration.md    env vars + CLI flags + settings.json keys
  - 18-error-taxonomy.md   typed errors per layer (filesystem boundary,
                           bridge errors, daemon-host error kinds,
                           boot-time config errors, device-flow)
  - 19-observability.md    QWEN_SERVE_DEBUG, debug recipes, /demo console

Each topic doc follows the same contract: Overview / Responsibilities /
Architecture / Workflow (with Mermaid sequence diagrams) / State &
Lifecycle / Dependencies / Configuration / Caveats & Known Limits /
References.

Pinned to the daemon_mode_b_main code surface (F2 pool, F3 mediator,
F4 prereqs). Some referenced files (McpTransportPool, state_resync_
required, validatePolicyConfig, FsError-over-wire, sanitizeForStderr)
land on main only when daemon_mode_b_main next batches up — the doc
set arrives ahead of the feature merges by design.

Author: doudouOUC

docs/developers/_meta.ts

@@ -21,6 +21,7 @@ export default {
   'channel-plugins': 'Channel Plugin Guide',
   tools: 'Tools',
   'qwen-serve-protocol': 'qwen serve HTTP protocol',
+  daemon: 'Daemon Mode (Developer Deep Dive)',
 
   examples: {
     display: 'hidden',