feat(gemini-web): Add conversation affinity selector

internal/provider/gemini-web/conversation/alias.go

@@ -0,0 +1,80 @@
+package conversation
+
+import (
+	"strings"
+	"sync"
+
+	"github.com/router-for-me/CLIProxyAPI/v6/internal/registry"
+)
+
+var (
+	aliasOnce sync.Once
+	aliasMap  map[string]string
+)
+
+// EnsureGeminiWebAliasMap populates the alias map once.
+func EnsureGeminiWebAliasMap() {
+	aliasOnce.Do(func() {
+		aliasMap = make(map[string]string)
+		for _, m := range registry.GetGeminiModels() {
+			if m.ID == "gemini-2.5-flash-lite" {
+				continue
+			}
+			if m.ID == "gemini-2.5-flash" {
+				aliasMap["gemini-2.5-flash-image-preview"] = "gemini-2.5-flash"
+			}
+			alias := AliasFromModelID(m.ID)
+			aliasMap[strings.ToLower(alias)] = strings.ToLower(m.ID)
+		}
+	})
+}
+
+// MapAliasToUnderlying normalizes a model alias to its underlying identifier.
+func MapAliasToUnderlying(name string) string {
+	EnsureGeminiWebAliasMap()
+	n := strings.ToLower(strings.TrimSpace(name))
+	if n == "" {
+		return n
+	}
+	if u, ok := aliasMap[n]; ok {
+		return u
+	}
+	const suffix = "-web"
+	if strings.HasSuffix(n, suffix) {
+		return strings.TrimSuffix(n, suffix)
+	}
+	return n
+}
+
+// AliasFromModelID mirrors the original helper for deriving alias IDs.
+func AliasFromModelID(modelID string) string {
+	return modelID + "-web"
+}
+
+// NormalizeModel returns the canonical identifier used for hashing.
+func NormalizeModel(model string) string {
+	return MapAliasToUnderlying(model)
+}
+
+// GetGeminiWebAliasedModels returns alias metadata for registry exposure.
+func GetGeminiWebAliasedModels() []*registry.ModelInfo {
+	EnsureGeminiWebAliasMap()
+	aliased := make([]*registry.ModelInfo, 0)
+	for _, m := range registry.GetGeminiModels() {
+		if m.ID == "gemini-2.5-flash-lite" {
+			continue
+		} else if m.ID == "gemini-2.5-flash" {
+			cpy := *m
+			cpy.ID = "gemini-2.5-flash-image-preview"
+			cpy.Name = "gemini-2.5-flash-image-preview"
+			cpy.DisplayName = "Nano Banana"
+			cpy.Description = "Gemini 2.5 Flash Preview Image"
+			aliased = append(aliased, &cpy)
+		}
+		cpy := *m
+		cpy.ID = AliasFromModelID(m.ID)
+		cpy.Name = cpy.ID
+		aliased = append(aliased, &cpy)
+	}
+	return aliased
+}