feat(config): opt-in autoModelPath for SDK model-path pinning

The SDK now defaults automatic DeepSeek model-path selection to off, so
surface it as an operator setting: `autoModelPath` in
~/.routstrd/config.json (default false), threaded into routeRequests via
the daemon request handler. Explicit x-routstr-model-path headers are
unaffected.

Requires a daemon restart after changing the value, matching how the other
startup config fields reach the handler. Documented in the README config
section; the config-store scenario covers the default and a round-trip.

README.md

@@ -276,6 +276,7 @@ Configuration is stored in `~/.routstrd/config.json`:
   "host": "127.0.0.1",
   "provider": null,
   "cocodPath": null,
+  "autoModelPath": false,
   "autoRefresh": { "enabled": true }
 }
 ```
@@ -287,6 +288,11 @@ every 21 minutes. Set it to `false` (or run
 refresh manually with `routstrd clients --manual-refresh`. `autoRefresh.intervalMs`
 overrides the 21-minute interval.
 
+`autoModelPath` defaults to `false`. Set it to `true` to let the SDK automatically
+choose and pin an advertised model path for `deepseek-v4.1-flash` requests.
+Explicit `x-routstr-model-path` request headers work independently of this
+setting and take precedence. Restart the daemon after changing `autoModelPath`.
+
 ### Environment Variables
 
 - `ROUTSTRD_DIR` - Config directory (default: `~/.routstrd`)

src/daemon/http/index.ts

@@ -392,6 +392,8 @@ export function createDaemonRequestHandler(deps: {
   mode?: "xcashu" | "apikeys";
   /** Default max_tokens/max_output_tokens to inject when the client omits one. */
   maxTokens: number;
+  /** Enable SDK automatic DeepSeek V4.1 Flash model-path selection. */
+  autoModelPath?: boolean;
   /** Nostr hex pubkey for routstr review/audit events (kind 38425). */
   routstrPubkey?: string;
   /** Nostr hex pubkey for the routstr-21 model list only (kind 38423). Falls back to routstrPubkey. */
@@ -1932,6 +1934,7 @@ export function createDaemonRequestHandler(deps: {
         requestBody,
         path: url.pathname,
         forcedProvider,
+        autoModelPath: deps.autoModelPath === true,
         headers: incomingHeaders,
         walletAdapter: deps.walletAdapter,
         storageAdapter: deps.storageAdapter,

src/daemon/index.ts

@@ -214,6 +214,7 @@ export async function runDaemon(argv: string[] = process.argv): Promise<void> {
       getModelProviders,
       refreshProvidersAndModels,
       mode: config.mode || "apikeys",
+      autoModelPath: config.autoModelPath === true,
       maxTokens: config.maxTokens ?? 64000,
       routstrPubkey: config.routstrPubkey,
       routstrModelsPubkey: config.routstrModelsPubkey,

src/utils/config.ts

@@ -48,6 +48,8 @@ export interface RoutstrdConfig {
   provider: string | null;
   cocodPath: string | null;
   mode?: "xcashu" | "apikeys";
+  /** Opt into SDK automatic model-path selection for DeepSeek V4.1 Flash. Disabled by default; requires daemon restart after changing. */
+  autoModelPath?: boolean;
   /** Raw upstream request/response logging. Disabled by default because logs can contain sensitive prompts, outputs, and auth/payment headers. */
   requestResponseLogging?: {
     /** Enable raw request/response file logging. */
@@ -87,5 +89,6 @@ export const DEFAULT_CONFIG: RoutstrdConfig = {
   provider: null,
   cocodPath: null,
   mode: "apikeys",
+  autoModelPath: false,
   maxTokens: 64000,
 };

tests/daemon/config-store.scenario.ts

@@ -38,8 +38,10 @@ const scenario = process.argv[2];
 
 switch (scenario) {
   case "fresh-install": {
+    assert(loadDaemonConfigSync().autoModelPath === false, "autoModelPath must default to false");
     saveDaemonConfig({
       ...baseConfig,
+      autoModelPath: true,
       nsec: "nsec1qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq",
     });
     assert(modeOf(CONFIG_DIR) === 0o700, `dir mode ${modeOf(CONFIG_DIR).toString(8)} != 700`);
@@ -54,6 +56,7 @@ switch (scenario) {
       "nsec round-trip failed",
     );
     assert(loaded.port === 8008, "port round-trip failed");
+    assert(loaded.autoModelPath === true, "autoModelPath round-trip failed");
 
     await ensureDirs();
     assert(modeOf(CONFIG_DIR) === 0o700, "ensureDirs dir mode");