Build the image pipeline in pixad's fx graph (closes #313)

The new package internal/providers builds the cache, the fetcher, the
processor, the image service, the session manager and the encrypted URL
generator from the config. providers.Option gives them to pixad's fx
graph, and handlers.New receives them built. The server tests build the
same graph, with only the fetcher's dial function replaced. database.New
opens the database, so these parts can read it while fx builds them; the
cache's stop hook still runs before the database's.

Each setting's default is declared in internal/config, and
internal/providers works out the default cache_max_bytes. The cache's
MaxBytes is the one value for the disk cache limit, and 0 turns the disk
cache off. The fetcher and the processor take explicit values.

Model: opus-5-5

internal/database/database.go

@@ -82,7 +82,11 @@ func ParseMigrationVersion(filename string) (int, error) {
 	return version, nil
 }
 
-// New creates a new Database instance.
+// New opens the database and applies the migrations, so that the parts
+// fx builds after it can read the database while they are built. Its
+// stop hook closes the database. fx runs stop hooks in the reverse of the
+// order it built their parts in, so the stop hooks of those parts run
+// before this one.
 func New(lc fx.Lifecycle, params Params) (*Database, error) {
 	s := &Database{
 		log:    params.Logger.Get(),
@@ -91,20 +95,16 @@ func New(lc fx.Lifecycle, params Params) (*Database, error) {
 
 	s.log.Info("Database instantiated")
 
-	lc.Append(fx.Hook{
-		OnStart: func(ctx context.Context) error {
-			s.log.Info("Database OnStart Hook")
+	err := s.connect(context.Background())
+	if err != nil {
+		return nil, err
+	}
 
-			return s.connect(ctx)
-		},
+	lc.Append(fx.Hook{
 		OnStop: func(_ context.Context) error {
 			s.log.Info("Database OnStop Hook")
 
-			if s.db != nil {
-				return s.db.Close()
-			}
-
-			return nil
+			return s.db.Close()
 		},
 	})