chore: 保存当前架构收口与 bug 修复快照

归档本轮 P0/P1 bug 修复、设计审查迁移、AI selection scope 收口与 stream contract 调整，并保留当前 05 主线迁移起点。

convex/schema.ts

@@ -0,0 +1,52 @@
+import { defineSchema, defineTable } from "convex/server";
+import { v } from "convex/values";
+
+export default defineSchema({
+  acp_runtime_runs: defineTable({
+    id: v.string(),
+    user_id: v.string(),
+    workspace_id: v.union(v.string(), v.null()),
+    document_id: v.string(),
+    session_id: v.string(),
+    run_id: v.string(),
+    title: v.union(v.string(), v.null()),
+    profile: v.string(),
+    acp_runtime: v.string(),
+    source: v.literal("acp"),
+    status: v.string(),
+    trace_id: v.string(),
+    runtime: v.any(),
+    usage: v.any(),
+    payload: v.any(),
+    retention: v.any(),
+    created_at: v.string(),
+    updated_at: v.string(),
+    deleted_at: v.union(v.string(), v.null()),
+  })
+    .index("by_run_id", ["run_id"])
+    .index("by_user_workspace_document", ["user_id", "workspace_id", "document_id", "created_at"])
+    .index("by_user_workspace_session", ["user_id", "workspace_id", "session_id", "created_at"])
+    .index("by_user_created_at", ["user_id", "created_at"]),
+
+  acp_runtime_events: defineTable({
+    id: v.string(),
+    user_id: v.string(),
+    workspace_id: v.union(v.string(), v.null()),
+    document_id: v.string(),
+    session_id: v.string(),
+    run_id: v.string(),
+    profile: v.string(),
+    acp_runtime: v.string(),
+    source: v.literal("acp"),
+    event_type: v.string(),
+    payload: v.any(),
+    created_at: v.string(),
+  })
+    .index("by_run_created_at", ["run_id", "created_at"])
+    .index("by_user_workspace_session_created_at", [
+      "user_id",
+      "workspace_id",
+      "session_id",
+      "created_at",
+    ]),
+});