Migrate db, auth to mcdsl; remove mcias client dependency

- db.Open: delegate to mcdsl/db.Open
- db.Migrate: convert to mcdsl/db.Migration format, delegate
- auth: type aliases for TokenInfo/Authenticator/Config from mcdsl,
  re-export error sentinels, Logout helper
- cmd/server: construct auth.Authenticator from Config (not mcias.Client)
- server/routes.go logout: use auth.Logout(authenticator, token)
- grpcserver/auth.go: same logout pattern, fix Login return type
  (time.Time not string)
- webserver: replace mcias.Client with mcdsl/auth for service token
  validation; resolveUser degrades to raw UUID (TODO: restore when
  mcias client library is properly tagged)
- Dockerfiles: bump to golang:1.25-alpine, remove gcc/musl-dev,
  add VERSION build arg
- Deploy: add docker-compose-rift.yml with localhost-only port mapping
- Remove git.wntrmute.dev/kyle/mcias/clients/go dependency entirely
- All tests pass, net -185 lines

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

go.mod

@@ -1,23 +1,18 @@
 module git.wntrmute.dev/kyle/metacrypt
 
-go 1.25.0
-
-replace git.wntrmute.dev/kyle/mcias/clients/go => /Users/kyle/src/mcias/clients/go
-
-replace git.wntrmute.dev/kyle/goutils => /Users/kyle/src/goutils
+go 1.25.7
 
 require (
 	git.wntrmute.dev/kyle/goutils v1.21.0
-	git.wntrmute.dev/kyle/mcias/clients/go v0.0.0-00010101000000-000000000000
+	git.wntrmute.dev/kyle/mcdsl v0.0.0
 	github.com/go-chi/chi/v5 v5.2.5
-	github.com/pelletier/go-toml/v2 v2.2.4
+	github.com/pelletier/go-toml/v2 v2.3.0
 	github.com/spf13/cobra v1.10.2
 	github.com/spf13/viper v1.21.0
 	golang.org/x/crypto v0.49.0
 	golang.org/x/term v0.41.0
-	google.golang.org/grpc v1.79.2
+	google.golang.org/grpc v1.79.3
 	google.golang.org/protobuf v1.36.11
-	modernc.org/sqlite v1.46.1
 )
 
 require (
@@ -36,12 +31,14 @@ require (
 	github.com/spf13/pflag v1.0.10 // indirect
 	github.com/subosito/gotenv v1.6.0 // indirect
 	go.yaml.in/yaml/v3 v3.0.4 // indirect
-	golang.org/x/exp v0.0.0-20251023183803-a4bb9ffd2546 // indirect
 	golang.org/x/net v0.51.0 // indirect
 	golang.org/x/sys v0.42.0 // indirect
 	golang.org/x/text v0.35.0 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20251202230838-ff82c1b0f217 // indirect
-	modernc.org/libc v1.67.6 // indirect
+	modernc.org/libc v1.70.0 // indirect
 	modernc.org/mathutil v1.7.1 // indirect
 	modernc.org/memory v1.11.0 // indirect
+	modernc.org/sqlite v1.47.0 // indirect
 )
+
+replace git.wntrmute.dev/kyle/mcdsl => /home/kyle/src/metacircular/mcdsl