Add support for Tool Override to the Operator

[blkt]

Extend MCPServer CRD in cmd/thv-operator/api/v1alpha1/mcpserver_types.go.
Add ToolOverrides field to MCPServerSpec.
Define ToolOverride struct for CRD.

Update operator controller in cmd/thv-operator/controllers/mcpserver_controller.go.
Handle tool override configuration in reconciliation.
Pass overrides to proxy runner configuration.
Update Helm charts in deploy/charts/.
Add tool override configuration to operator values.
Update CRD templates to include override fields.