feat: load service adapters from ConfigMap, remove k8s API dependency

Adapters defined in config.yaml alongside routes and models.
Parsed by existing config loader, populated into registry at startup.
Removed: client-go deps, REST loader, informer, nginx proxy,
CiliumNetworkPolicy, apis/gateway/v1/ (duplicate types).
Kept: merged CI pipeline, imagePullPolicy Always, CA certs in Dockerfile.

internal/serviceadapter/types.go

@@ -6,39 +6,39 @@ import (
 
 // Upstream defines an upstream target.
 type Upstream struct {
-	URL            string `json:"url"`
-	TimeoutSeconds int32  `json:"timeoutSeconds"`
+	URL            string `json:"url" yaml:"url"`
+	TimeoutSeconds int32  `json:"timeoutSeconds" yaml:"timeoutSeconds"`
 }
 
 // Auth defines authentication requirements.
 type Auth struct {
-	Required   bool   `json:"required"`
-	Capability string `json:"capability,omitempty"`
+	Required   bool   `json:"required" yaml:"required"`
+	Capability string `json:"capability,omitempty" yaml:"capability,omitempty"`
 }
 
 // Method defines an HTTP method endpoint.
 type Method struct {
-	Verb           string `json:"verb"`
-	UpstreamPath   string `json:"upstreamPath"`
-	RequestSchema  string `json:"requestSchema,omitempty"`
-	ResponseSchema string `json:"responseSchema,omitempty"`
-	Auth           *Auth  `json:"auth,omitempty"`
+	Verb           string `json:"verb" yaml:"verb"`
+	UpstreamPath   string `json:"upstreamPath" yaml:"upstreamPath"`
+	RequestSchema  string `json:"requestSchema,omitempty" yaml:"requestSchema,omitempty"`
+	ResponseSchema string `json:"responseSchema,omitempty" yaml:"responseSchema,omitempty"`
+	Auth           *Auth  `json:"auth,omitempty" yaml:"auth,omitempty"`
 }
 
 // Resource defines a resource with multiple methods.
 type Resource struct {
-	Name    string    `json:"name"`
-	Methods []Method  `json:"methods"`
-	Auth    *Auth     `json:"auth,omitempty"`
+	Name    string    `json:"name" yaml:"name"`
+	Methods []Method  `json:"methods" yaml:"methods"`
+	Auth    *Auth     `json:"auth,omitempty" yaml:"auth,omitempty"`
 }
 
 // Spec is the ServiceAdapter spec.
 type Spec struct {
-	ServiceName string      `json:"serviceName"`
-	Upstream    Upstream    `json:"upstream"`
-	Auth        Auth        `json:"auth"`
-	Retryable   bool        `json:"retryable,omitempty"`
-	Resources   []Resource  `json:"resources"`
+	ServiceName string      `json:"serviceName" yaml:"serviceName"`
+	Upstream    Upstream    `json:"upstream" yaml:"upstream"`
+	Auth        Auth        `json:"auth" yaml:"auth"`
+	Retryable   bool        `json:"retryable,omitempty" yaml:"retryable,omitempty"`
+	Resources   []Resource  `json:"resources" yaml:"resources"`
 }
 
 // Status is the ServiceAdapter status.