feat: Add Anthropic Messages API support (#7948)

* Initial plan

* Add Anthropic Messages API support

Co-authored-by: mudler <2420543+mudler@users.noreply.github.com>

* Fix code review comments: add error handling for JSON operations

Co-authored-by: mudler <2420543+mudler@users.noreply.github.com>

* Fix test suite to use existing schema test runner

Co-authored-by: mudler <2420543+mudler@users.noreply.github.com>

* Add Anthropic e2e tests using anthropic-sdk-go for streaming and non-streaming

Co-authored-by: mudler <2420543+mudler@users.noreply.github.com>

* Co-authored-by: mudler <2420543+mudler@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: mudler <2420543+mudler@users.noreply.github.com>

go.mod

@@ -9,6 +9,7 @@ require (
 	fyne.io/fyne/v2 v2.7.1
 	github.com/Masterminds/sprig/v3 v3.3.0
 	github.com/alecthomas/kong v1.13.0
+	github.com/anthropics/anthropic-sdk-go v1.19.0
 	github.com/charmbracelet/glamour v0.10.0
 	github.com/containerd/containerd v1.7.30
 	github.com/ebitengine/purego v0.9.1
@@ -58,6 +59,7 @@ require (
 	go.opentelemetry.io/otel/metric v1.39.0
 	go.opentelemetry.io/otel/sdk/metric v1.39.0
 	google.golang.org/grpc v1.78.0
+	google.golang.org/protobuf v1.36.10
 	gopkg.in/yaml.v2 v2.4.0
 	gopkg.in/yaml.v3 v3.0.1
 	oras.land/oras-go/v2 v2.6.0
@@ -67,8 +69,11 @@ require (
 	github.com/ghodss/yaml v1.0.0 // indirect
 	github.com/labstack/gommon v0.4.2 // indirect
 	github.com/swaggo/files/v2 v2.0.2 // indirect
+	github.com/tidwall/gjson v1.18.0 // indirect
+	github.com/tidwall/match v1.1.1 // indirect
+	github.com/tidwall/pretty v1.2.1 // indirect
+	github.com/tidwall/sjson v1.2.5 // indirect
 	github.com/valyala/fasttemplate v1.2.2 // indirect
-	google.golang.org/protobuf v1.36.10 // indirect
 )
 
 require (