Finish Phase 6: Push frontend, WebAuthn frontend, OpenAPI/Swagger

Frontend:
- stores/push.ts: fixed VAPID key endpoint, added checkSubscription, proper subscription format
- UserSettings.tsx: added [ENABLE PUSH] toggle and [REGISTER PASSKEY] button
- LoginForm.tsx: added [SIGN IN WITH PASSKEY] button

Backend:
- cmd/server/main.go: added Swagger annotations, /docs/* route
- docs/: generated swagger.json, swagger.yaml, docs.go
- Makefile: added docs target for swag init

cmd/server/main.go

@@ -7,6 +7,7 @@ import (
 	"net/http"
 	"os"
 
+	_ "git.dustin.coffee/hobokenchicken/dumpsterChat/docs"
 	"git.dustin.coffee/hobokenchicken/dumpsterChat/internal/auth"
 	"git.dustin.coffee/hobokenchicken/dumpsterChat/internal/bot"
 	"git.dustin.coffee/hobokenchicken/dumpsterChat/internal/channel"
@@ -24,8 +25,18 @@ import (
 	"git.dustin.coffee/hobokenchicken/dumpsterChat/internal/webhook"
 	"github.com/go-chi/chi/v5"
 	chimw "github.com/go-chi/chi/v5/middleware"
+	httpSwagger "github.com/swaggo/http-swagger"
 )
 
+// @title Dumpster API
+// @version 1.0
+// @description A chaotic, self-hosted Discord-like platform API
+// @host localhost:8080
+// @BasePath /api/v1
+// @schemes http https
+// @securityDefinitions.apikey SessionAuth
+// @in cookie
+// @name dumpster_session
 func main() {
 	logger := slog.New(slog.NewTextHandler(os.Stdout, nil))
 
@@ -190,6 +201,11 @@ func main() {
 		webhook.NewHandler(database.DB, hub).Execute(w, r)
 	})
 
+	// Swagger UI
+	r.Get("/docs/*", httpSwagger.Handler(
+		httpSwagger.URL("/docs/swagger.json"),
+	))
+
 	// Static file serving for production (SPA)
 	staticDir := "/srv/web"
 	if _, err := os.Stat(staticDir); err == nil {