chore: 升级 picoclaw 依赖至 v0.2.7

- 更新 github.com/sipeed/picoclaw v0.2.6 → v0.2.7
- 配置版本从 v2 升级至 v3
- 同步更新相关间接依赖（golang.org/x/*, modernc.org/sqlite 等）

go.mod

@@ -10,7 +10,7 @@ require (
 	github.com/ergochat/readline v0.1.3
 	github.com/google/uuid v1.6.0
 	github.com/muesli/termenv v0.16.0
-	github.com/sipeed/picoclaw v0.2.6
+	github.com/sipeed/picoclaw v0.2.7
 	github.com/tursodatabase/libsql-client-go v0.0.0-00010101000000-000000000000
 	gopkg.in/yaml.v3 v3.0.1
 )
@@ -58,7 +58,7 @@ require (
 	github.com/github/copilot-sdk/go v0.2.0 // indirect
 	github.com/go-logr/logr v1.4.3 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
-	github.com/gomarkdown/markdown v0.0.0-20260217112301-37c66b85d6ab // indirect
+	github.com/gomarkdown/markdown v0.0.0-20260411013819-759bbc3e3207 // indirect
 	github.com/google/jsonschema-go v0.4.2 // indirect
 	github.com/gorilla/css v1.0.1 // indirect
 	github.com/h2non/filetype v1.1.3 // indirect
@@ -91,17 +91,17 @@ require (
 	go.opentelemetry.io/otel v1.35.0 // indirect
 	go.opentelemetry.io/otel/metric v1.35.0 // indirect
 	go.opentelemetry.io/otel/trace v1.35.0 // indirect
-	golang.org/x/crypto v0.49.0 // indirect
-	golang.org/x/exp v0.0.0-20260312153236-7ab1446f8b90 // indirect
-	golang.org/x/net v0.52.0 // indirect
+	golang.org/x/crypto v0.50.0 // indirect
+	golang.org/x/exp v0.0.0-20260410095643-746e56fc9e2f // indirect
+	golang.org/x/net v0.53.0 // indirect
 	golang.org/x/oauth2 v0.36.0 // indirect
 	golang.org/x/sync v0.20.0 // indirect
 	golang.org/x/sys v0.43.0 // indirect
-	golang.org/x/term v0.41.0 // indirect
-	golang.org/x/text v0.35.0 // indirect
+	golang.org/x/term v0.42.0 // indirect
+	golang.org/x/text v0.36.0 // indirect
 	golang.org/x/time v0.15.0 // indirect
 	modernc.org/libc v1.70.0 // indirect
 	modernc.org/mathutil v1.7.1 // indirect
 	modernc.org/memory v1.11.0 // indirect
-	modernc.org/sqlite v1.48.0 // indirect
+	modernc.org/sqlite v1.48.2 // indirect
 )