refactor(api): split monolithic handlers.go into focused modules

Break down the 627-line handlers.go into specialized modules:
- handlers_chat.go: chat and streaming endpoints
- handlers_config.go: configuration endpoints
- handlers_common.go: shared utilities
- handlers_info.go: info and status endpoints
- handlers_terminal.go: terminal/shell endpoints
- handlers_tools.go: tool-related endpoints

Also includes config improvements, orchestrator enhancements, and
web component updates.

💘 Generated with Crush

Assisted-by: MiniMax-M2.7 via Crush <crush@charm.land>

.gitea/workflows/ci-develop.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.24.3'
+          go-version: '1.24'
 
       - name: Setup Node
         uses: actions/setup-node@v4

.gitea/workflows/ci-main.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.24.3'
+          go-version: '1.24'
 
       - name: Setup Node
         uses: actions/setup-node@v4

.gitea/workflows/ci-pr.yml

@@ -13,7 +13,7 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.24.3'
+          go-version: '1.24'
 
       - name: Setup Node
         uses: actions/setup-node@v4