feat: add agent skills and guardrails functionality

- Introduced new tools for managing agent skills and guardrails, including add, remove, and list operations.
- Updated README.md to document new commands and usage patterns for skills and guardrails.
- Enhanced server configuration to support longer read and write timeouts.
- Increased maximum upload size for files to 100 MB and adjusted related configurations.
- Created database migrations for agent skills, guardrails, and their associations with projects.
- Updated relevant code files to integrate new skills and guardrails into the application logic.

internal/config/loader.go

@@ -50,8 +50,8 @@ func defaultConfig() Config {
 		Server: ServerConfig{
 			Host:         "0.0.0.0",
 			Port:         8080,
-			ReadTimeout:  15 * time.Second,
-			WriteTimeout: 30 * time.Second,
+			ReadTimeout:  10 * time.Minute,
+			WriteTimeout: 10 * time.Minute,
 			IdleTimeout:  60 * time.Second,
 		},
 		MCP: MCPConfig{