feat(p2p,realtime,functions,model): A级任务大更新 — p2p节点快照/reasoning解析器/realtime ephemeral key/分布式缓存

[ghshhf]

变更摘要

P2P

• 新增 NodeConfig 结构体，统一管理 P2P 配置（替代分散的环境变量读取）
• discoveryTunnels 返回全节点快照（chan []schema.NodeData）
• 新增 ReplaceNodes，用最新快照整体替换本地节点视图

Reasoning 解析器

• 在 parse.go 的 XMLToolCallFormat 中扩展 thinking/reasoning 相关字段
• iterative_parser.go 支持 reasoning 内容剥离与初始推理块

Realtime API

• RealtimeSessions 生成 60s HMAC 短期令牌（lai-sess 前缀）
• Realtime 握手通过 Authorization Bearer 或 ?session= 参数校验
• transcription 模型可选，any-to-any 自动判定

分布式缓存

• replicaCache 按 modelID 缓存最近使用的模型副本
• 减少重复的 FindAndLockNodeWithModel DB 调用

附带

• metrics、monitoring、worker、templates、mcp httpapi 的相关完善

测试

• 本地 go vet 通过
• 构建通过（go build ./...）

[localai-bot]

Thanks @ghshhf. There's useful work here (the GetConfigEndpoint/MCP wiring, OTel Shutdown, and context plumbing are fine), but I can't merge this as-is.

Please open an issue first for changes this large. This bundles ~7 unrelated features into one squash. Anything touching P2P, auth, or the distributed hot path needs a design discussion before the code. Split it into one PR per concern.

Blockers:

1. replicaCache is dead code. StartReplicaCache() is never called, so the ~150-line cache and LoadModel rewrite are inert. If wired up, caching one *Model per modelID for 5s re-pins all traffic to a single replica — the exact bug the comment I deleted warned about. The comments also describe machinery that doesn't exist (in-flight counters, a refresher goroutine). Remove it or implement it properly with tests.

2. Reasoning-parser fields are no-ops. In iterative_parser.go the if format.ReasoningInContent {…} else {…} branches are byte-identical. ReasoningInContent/ReasoningFormat get added to the public schema but do nothing. Implement or drop them. (ThinkingForcedOpen is actually wired.)

3. P2P cancellation can flap. Phase 3 cancels+deletes any service missing from the current ledger snapshot, and ReplaceNodes wholesale-replaces the view — a transient ledger gap will tear down a live tunnel. The old append-only AddNode was resilient to this; needs testing under churn. (The muservice.Lock()/Unlock() there also guards only comments.)

4. No tests. The HMAC handshake and P2P snapshot/cancel ship with zero tests — this trips the coverage gate, and the sign/validate round-trip is trivially testable.

Minor on the realtime keys (HMAC itself is sound): not actually single-use despite the comment, the signed userID is discarded so it isn't bound to a user, and several response fields are fabricated vs the OpenAI schema.

Last thing: the comment style suggests AI assistance — fine, but per .agents/ai-coding-assistants.md it needs an Assisted-by: trailer, and every line should be human-reviewed/tested. The dead code suggests that didn't happen.

If you want to proceed: open an issue, then start with the uncontroversial subset (config-yaml endpoint, OTel shutdown, context plumbing) as a small first PR.