重构会话管理功能，由后端 opencode 发放 sessionId，后端做 scope

.opencode/tools/dynamic_http_call.ts

@@ -1,7 +1,10 @@
 import { tool } from "@opencode-ai/plugin";
+import { ToolSessionContextStore } from "../../src/session/toolContextStore.js";
 
 const internalBaseUrl = process.env.TJWATER_AGENT_INTERNAL_BASE_URL ?? "http://127.0.0.1:8787";
 const internalToken = process.env.TJWATER_AGENT_INTERNAL_TOKEN ?? "";
+const toolContextStore = new ToolSessionContextStore();
+const initializePromise = toolContextStore.initialize();
 
 export default tool({
   description:
@@ -21,6 +24,11 @@ export default tool({
       .describe("Query arguments object."),
   },
   async execute(args, context) {
+    await initializePromise;
+    const sessionContext = await toolContextStore.read(context.sessionID);
+    if (!sessionContext) {
+      throw new Error(`session context not found for ${context.sessionID}`);
+    }
     // 工具本身不直接持有用户 token；通过 sessionID 回调 Agent 服务，由服务侧补齐用户上下文。
     const response = await fetch(`${internalBaseUrl}/internal/tools/dynamic-http-call`, {
       method: "POST",
@@ -29,7 +37,7 @@ export default tool({
         "x-agent-internal-token": internalToken,
       },
       body: JSON.stringify({
-        sessionId: context.sessionID,
+        sessionScopeKey: sessionContext.sessionScopeKey,
         reason: args.reason,
         path: args.path,
         method: args.method,