refactor: rename agent widget references to AI agent for consistency

- Updated runtime configuration to use __CS_AI_AGENT_WIDGET_CONFIG__ instead of __CS_AGENT_WIDGET_CONFIG__.
- Changed message types in support host bridge from "cs-agent" to "cs-ai-agent".
- Minified SDK script updated to reflect new AI agent naming conventions.
- Adjusted scrollbar styles in main.scss to use .cs-ai-agent-scrollbar instead of .cs-agent-scrollbar.

cmd/testdata/main.go

@@ -1,16 +1,16 @@
 package main
 
 import (
-	"cs-agent/cmd/testdata/agentteam"
-	"cs-agent/cmd/testdata/aiagent"
-	"cs-agent/cmd/testdata/aiconfig"
-	"cs-agent/cmd/testdata/channel"
-	"cs-agent/cmd/testdata/kb"
-	"cs-agent/cmd/testdata/quickreply"
-	"cs-agent/cmd/testdata/skill"
-	"cs-agent/cmd/testdata/tag"
-	"cs-agent/internal/bootstrap"
-	"cs-agent/internal/pkg/config"
+	"cs-ai-agent/cmd/testdata/agentteam"
+	"cs-ai-agent/cmd/testdata/aiagent"
+	"cs-ai-agent/cmd/testdata/aiconfig"
+	"cs-ai-agent/cmd/testdata/channel"
+	"cs-ai-agent/cmd/testdata/kb"
+	"cs-ai-agent/cmd/testdata/quickreply"
+	"cs-ai-agent/cmd/testdata/skill"
+	"cs-ai-agent/cmd/testdata/tag"
+	"cs-ai-agent/internal/bootstrap"
+	"cs-ai-agent/internal/pkg/config"
 	"flag"
 	"fmt"
 	"log/slog"