feat(settings): agent.sessionDir setting shown on settings page

null keeps the deployment default (AGENT_SESSION_DIR / DATA_DIR/agent-sessions).

Co-Authored-By: Claude Opus 5.5 <[email protected]>

apps/server/src/modules/agent/runner.ts

@@ -81,9 +81,16 @@ export function scopeFor(mode: "execute" | "plan_only", allowlist?: readonly str
   return { capabilities: allowlist?.length ? [...allowlist] : all.map((d) => d.id), allowedKinds: null };
 }
 
-export function sessionDirOf(env: AgentEnv): string {
+/**
+ * 会话目录优先级:模块装配参数(测试)> settings.agent.sessionDir > AGENT_SESSION_DIR(main 按 DATA_DIR 算好注入)
+ * > ./data/agent-sessions
+ */
+export function sessionDirOf(env: AgentEnv, configured?: string | null): string {
   return resolve(
-    env.opts.sessionDir ?? Deno.env.get("AGENT_SESSION_DIR") ?? join(Deno.cwd(), "data", "agent-sessions"),
+    env.opts.sessionDir ??
+      configured ??
+      Deno.env.get("AGENT_SESSION_DIR") ??
+      join(Deno.cwd(), "data", "agent-sessions"),
   );
 }
 
@@ -349,7 +356,7 @@ export async function drive(
       systemPrompt: systemPromptFor(run, scope),
       capabilities: scope.capabilities?.length ? scope.capabilities : Object.keys(CAPABILITY_CATALOG),
       settings,
-      sessionDir: sessionDirOf(env),
+      sessionDir: sessionDirOf(env, s.agent.sessionDir),
       actor,
       firstSeq: maxSeq?.m === null || maxSeq?.m === undefined ? 0 : Number(maxSeq.m) + 1,
     });