[Enhancement] Self-hosted reliability for long-running/local model requests

[joonsoome]

Summary

This PR improves self-host reliability for long-running local-model requests in Node self-host deployments, while preserving default behavior when Local Network Mode is disabled.

What changed

1) Local Network routing for OpenAI-compatible requests

• Added local/private network detection utilities.
• Added DB/preset controls:
  • localNetworkMode
  • localNetworkTimeoutSec
• Extended fetch args:
  • networkRoute?: 'auto' | 'local_network'
  • requestTimeoutMs?: number
• Applied routing only for OpenAI-compatible request paths:
  • Node self-host:
    • non-streaming => /proxy2
    • streaming => Job + WebSocket relay (/proxy-stream-jobs + /proxy-stream-jobs/:jobId/ws), fallback to /proxy2
  • Tauri => native/direct path
  • Public web runtime => local/private direct calls are blocked when Local Network Mode is enabled
• Added timeout propagation and abort handling.

2) Proxy Job + WebSocket relay (Node self-host, streaming)

• Added server-side job registry and lifecycle endpoints:
  • POST /proxy-stream-jobs
  • DELETE /proxy-stream-jobs/:jobId
  • WS /proxy-stream-jobs/:jobId/ws
• Added event streaming protocol (job_accepted, upstream_headers, chunk, error, done, ping).
• Added auth checks, local-target validation, rate limiting, job caps, timeout/cleanup hardening.
• Kept existing /proxy2 path for fallback/regression safety.

3) Trigger v2 LLM streaming fix

• Fixed v2RunLLM to honor streaming.
• Added streaming text collection so output variables are populated correctly.
• Added Trigger v2 UI toggle/default for streaming mode.

4) UX/help update

• Added help tooltip for Local Network Mode (Experimental).
• Added English help text for:
  • purpose
  • runtime behavior
  • constraints

Architecture

flowchart LR

  subgraph A["1. Local ON, Node self-host"]
    direction TB
    A1["Browser"] --> A2["Cloudflare Tunnel or reverse proxy"] --> A3["Risu Node self-host"]
    A3 --> A4["Streaming OpenAI: POST /proxy-stream-jobs + WS relay, fallback /proxy2"]
    A3 --> A5["Non-stream OpenAI: /proxy2"]
    A4 --> A6["LAN model, 192.168.x.x or localhost"]
    A5 --> A6
  end

  subgraph B["2. Local OFF, Node self-host"]
    direction TB
    B1["Browser"] --> B2["Risu Node self-host frontend runtime"]
    B2 --> B3["Streaming OpenAI: browser fetch to target URL"]
    B2 --> B4["Non-stream OpenAI: /proxy2 default path"]
    B3 --> B5["Local URL may fail by browser private-network policy"]
  end

  subgraph C["3. Public web, risuai.xyz"]
    direction TB
    C1["Browser"] --> C2["hubURL/proxy2 path"] --> C3["Target URL"]
    C3 --> C4["Local Network ON: blocked immediately by policy"]
    C3 --> C5["Local Network OFF: may fail or timeout, origin cannot reach user LAN"]
  end

  A ~~~ B
  B ~~~ C

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