QVAC-20580 feat[api]: add subscribeServerLogs to capture all server logs

[arun-mani-j]

🎯 What problem does this PR solve?

• Server-side SDK logs could only be consumed per stream ID via loggingStream({ id }) — SDK_LOG_ID for SDK logs, each modelId for addon logs, each workspace key for RAG. There was no single mechanism to capture all server-side logs.
• Consumers (especially tests and integrations) had to open/manage multiple streams and know internal IDs ahead of time.
• Config already covered global log level and console output (loggerLevel, loggerConsoleOutput); the missing piece was a unified custom handler.

📝 How does it solve it?

• Adds subscribeServerLogs(handler) (client/api/subscribe-logs.ts): one subscription that receives every server-side log (SDK + all models + RAG + any future scope) and returns an unsubscribe(). No per-ID subscriptions, no internal IDs required.
• Introduces a reserved stream id SDK_ALL_LOG_ID ("__all__"). On the server, sendLogToStreams(id, …) now also fans out to the __all__ stream (server/bare/registry/logging-stream-registry.ts). Because every server logger already converges on sendLogToStreams (via createStreamLogger), this captures all scopes with no per-logger wiring.
• worker-core buffers startup logs for __all__ (mirroring existing SDK_LOG_ID buffering), so a subscriber attaching just after spawn still receives early logs.
• Exports subscribeServerLogs, ServerLogHandler, and SDK_ALL_LOG_ID from @qvac/sdk.

🧪 How was it tested?

• New unit test test/unit/logging-stream-global.test.ts: global stream receives logs across multiple source IDs, per-ID streams stay isolated, unsubscribe stops delivery, and buffered startup logs flush on subscribe. Full bun run test:unit passes.
• New example examples/logging-global.ts (+ examples/config/logging/logging.config.json): one handler captures all server logs end to end; verified against a live loadModel/completion run (27 server logs captured across sdk:server and llamacpp-completion).

🔌 API Changes

import { subscribeServerLogs } from "@qvac/sdk";

// One handler for every server-side log — no per-ID loggingStream() calls.
const unsubscribe = subscribeServerLogs((log) => {
  console.log(`[${log.level}] [${log.namespace}] ${log.message}`);
});

// later
unsubscribe();

[arun-mani-j]

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