Wire file.Service into api.Config, delete pkg/filesign

Replace the FileSign field in api.Config and server.Config with File
(*file.Service). Pass the new file.Service and other required deps to
files_v1.NewMux. Remove the now-redundant filesign package. Update
the favicon URL path to /api/files/v1/public/ in server.go.

Signed-off-by: Ludovic Vielle <ludovic@probo.com>

pkg/server/api/api.go

@@ -32,7 +32,7 @@ import (
 	"go.probo.inc/probo/pkg/connector/provider"
 	"go.probo.inc/probo/pkg/cookiebanner"
 	"go.probo.inc/probo/pkg/esign"
-	"go.probo.inc/probo/pkg/filesign"
+	"go.probo.inc/probo/pkg/file"
 	"go.probo.inc/probo/pkg/geoloc"
 	"go.probo.inc/probo/pkg/iam"
 	"go.probo.inc/probo/pkg/mailman"
@@ -56,7 +56,7 @@ type (
 		BaseURL           *baseurl.BaseURL
 		AllowedOrigins    []string
 		Probo             *probo.Service
-		FileSign          *filesign.Service
+		File              *file.Service
 		IAM               *iam.Service
 		Trust             *trust.Service
 		ESign             *esign.Service
@@ -210,7 +210,11 @@ func NewServer(cfg Config) (*Server, error) {
 		),
 		filesHandler: files_v1.NewMux(
 			cfg.Logger.Named("files.v1"),
-			cfg.FileSign,
+			cfg.File,
+			cfg.Probo,
+			cfg.IAM,
+			cfg.Cookie,
+			cfg.TokenSecret,
 		),
 		mcpHandler: mcp_v1.NewMux(
 			cfg.Logger.Named("mcp.v1"),