feat: Notifiers CRUD (#337)

* introduce scaffold for new models

* wip: shoutrrr wrapper (may remove)

* update schema files

* gen: ent code

* gen: migrations

* go mod tidy

* add group_id to notifier

* db migration

* new mapper helpers

* notifier repo

* introduce experimental adapter pattern for hdlrs

* refactor adapters to fit more common use cases

* new routes for notifiers

* update errors to fix validation panic

* go tidy

* reverse checkbox label display

* wip: notifiers UI

* use badges instead of text

* improve documentation

* add scaffold schema reference

* remove notifier service

* refactor schema folder

* support group edges via scaffold

* delete test file

* include link to API docs

* audit and update documentation + improve format

* refactor schema edges

* refactor

* add custom validator

* set validate + order fields by name

* fix failing tests

backend/internal/web/adapters/command.go

@@ -0,0 +1,62 @@
+package adapters
+
+import (
+	"context"
+	"net/http"
+
+	"github.com/google/uuid"
+	"github.com/hay-kot/homebox/backend/pkgs/server"
+)
+
+type CommandFunc[T any] func(context.Context) (T, error)
+type CommandIDFunc[T any] func(context.Context, uuid.UUID) (T, error)
+
+// Command is an HandlerAdapter that returns a server.HandlerFunc that
+// The command adapters are used to handle commands that do not accept a body
+// or a query. You can think of them as a way to handle RPC style Rest Endpoints.
+//
+// Example:
+//
+//	fn := func(ctx context.Context) (interface{}, error) {
+//		// do something
+//		return nil, nil
+//	}
+//
+//  r.Get("/foo", adapters.Command(fn, http.NoContent))
+func Command[T any](f CommandFunc[T], ok int) server.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) error {
+		res, err := f(r.Context())
+		if err != nil {
+			return err
+		}
+
+		return server.Respond(w, ok, res)
+	}
+}
+
+// CommandID is the same as the Command adapter but it accepts a UUID as a parameter
+// in the URL. The parameter name is passed as the first argument.
+//
+// Example:
+//
+//	fn := func(ctx context.Context, id uuid.UUID) (interface{}, error) {
+//		// do something
+//		return nil, nil
+//	}
+//
+//	r.Get("/foo/{id}", adapters.CommandID("id", fn, http.NoContent))
+func CommandID[T any](param string, f CommandIDFunc[T], ok int) server.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) error {
+		ID, err := routeUUID(r, param)
+		if err != nil {
+			return err
+		}
+
+		res, err := f(r.Context(), ID)
+		if err != nil {
+			return err
+		}
+
+		return server.Respond(w, ok, res)
+	}
+}