feat(landscape): HTTP API, worker consumer, wiring, docs

Adds the /landscape routes (slots, slot upload, runs, run detail, results),
mounts them in the router, wires the landscape repository, job publisher,
godal raster IO and Compute into the composition root, and registers the
gis-landscape-runner consumer in the worker.

Also fixes the Dockerfile so the image actually runs: godal's cgo needs g++,
and the runtime base must match the builder's Alpine release or libgdal's
soname does not resolve.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

internal/transport/http/landscape_handler.go

@@ -0,0 +1,170 @@
+package http
+
+import (
+	"net/http"
+
+	"gis/internal/landscape"
+	"gis/internal/service"
+	"gis/pkg/httputil"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/go-playground/validator/v10"
+	"github.com/google/uuid"
+)
+
+// LandscapeHandler serves the /landscape routes.
+type LandscapeHandler struct {
+	svc      *service.LandscapeService
+	validate *validator.Validate
+}
+
+// NewLandscapeHandler returns a LandscapeHandler.
+func NewLandscapeHandler(svc *service.LandscapeService, validate *validator.Validate) *LandscapeHandler {
+	return &LandscapeHandler{svc: svc, validate: validate}
+}
+
+// Register mounts the Landscape Program routes on r.
+func (h *LandscapeHandler) Register(r chi.Router) {
+	r.Get("/slots", h.slots)
+	r.Post("/slots/{code}", h.uploadSlot)
+	r.Get("/runs", h.listRuns)
+	r.Post("/runs", h.createRun)
+	r.Get("/runs/{id}", h.getRun)
+	r.Get("/results", h.results)
+}
+
+// runRequest is the body of POST /landscape/runs. Overrides are decoded as
+// strings so a malformed id is a 422 instead of a 400 on the whole body.
+type runRequest struct {
+	FromStage *int              `json:"from_stage" validate:"omitempty,gte=0,lte=3"`
+	Overrides map[string]string `json:"overrides" validate:"omitempty,dive,uuid"`
+	Params    *landscape.Params `json:"params"`
+}
+
+// slots lists every leaf input slot with the dataset currently filling it.
+func (h *LandscapeHandler) slots(w http.ResponseWriter, r *http.Request) {
+	slots, err := h.svc.Slots(r.Context())
+	if err != nil {
+		respondDomainError(w, err)
+		return
+	}
+	httputil.WriteJSON(w, http.StatusOK, slots)
+}
+
+// uploadSlot stores a raster in the slot's dataset group under the landscape
+// category. An unknown slot code yields 404.
+func (h *LandscapeHandler) uploadSlot(w http.ResponseWriter, r *http.Request) {
+	code := chi.URLParam(r, "code")
+
+	if err := r.ParseMultipartForm(maxUploadBytes); err != nil {
+		httputil.WriteError(w, http.StatusBadRequest, "request must be multipart/form-data")
+		return
+	}
+
+	file, header, err := r.FormFile("file")
+	if err != nil {
+		httputil.WriteError(w, http.StatusBadRequest, "file is required")
+		return
+	}
+	defer file.Close()
+
+	contentType := header.Header.Get("Content-Type")
+	if contentType == "" {
+		contentType = "image/tiff"
+	}
+
+	dataset, err := h.svc.UploadToSlot(r.Context(), code, service.SlotUploadInput{
+		Filename:    header.Filename,
+		ContentType: contentType,
+		Size:        header.Size,
+		Reader:      file,
+		Name:        r.FormValue("name"),
+		StartDate:   optionalFormValue(r, "start_date"),
+		EndDate:     optionalFormValue(r, "end_date"),
+	})
+	if err != nil {
+		respondDomainError(w, err)
+		return
+	}
+	httputil.WriteJSON(w, http.StatusCreated, dataset)
+}
+
+// createRun queues a Landscape Program run and returns it with 202 Accepted;
+// the worker executes it asynchronously.
+func (h *LandscapeHandler) createRun(w http.ResponseWriter, r *http.Request) {
+	req, err := httputil.DecodeJSON[runRequest](w, r)
+	if err != nil {
+		httputil.WriteError(w, http.StatusBadRequest, "invalid request body")
+		return
+	}
+	if err := h.validate.Struct(req); err != nil {
+		httputil.WriteValidationErrors(w, err)
+		return
+	}
+
+	overrides := make(map[string]uuid.UUID, len(req.Overrides))
+	for group, raw := range req.Overrides {
+		id, err := uuid.Parse(raw)
+		if err != nil {
+			httputil.WriteError(w, http.StatusUnprocessableEntity, "overrides["+group+"] must be a valid UUID")
+			return
+		}
+		overrides[group] = id
+	}
+
+	in := service.RunInput{FromStage: req.FromStage, Overrides: overrides}
+	if req.Params != nil {
+		in.Params = *req.Params
+	}
+
+	run, err := h.svc.CreateRun(r.Context(), in)
+	if err != nil {
+		respondDomainError(w, err)
+		return
+	}
+	httputil.WriteJSON(w, http.StatusAccepted, run)
+}
+
+// listRuns returns a page of runs, newest first.
+func (h *LandscapeHandler) listRuns(w http.ResponseWriter, r *http.Request) {
+	page, ok := parsePositiveIntQuery(w, r, "page", 1)
+	if !ok {
+		return
+	}
+	pageSize, ok := parsePositiveIntQuery(w, r, "page_size", service.DefaultPageSize)
+	if !ok {
+		return
+	}
+
+	result, err := h.svc.ListRuns(r.Context(), page, pageSize)
+	if err != nil {
+		respondDomainError(w, err)
+		return
+	}
+	httputil.WriteJSON(w, http.StatusOK, newPaginated(result.Items, result.Page, result.PageSize, result.Total))
+}
+
+// getRun returns one run with its per-node execution state.
+func (h *LandscapeHandler) getRun(w http.ResponseWriter, r *http.Request) {
+	id, ok := parseUUIDParam(w, r, "id")
+	if !ok {
+		return
+	}
+	run, err := h.svc.GetRun(r.Context(), id)
+	if err != nil {
+		respondDomainError(w, err)
+		return
+	}
+	httputil.WriteJSON(w, http.StatusOK, run)
+}
+
+// results lists every output group with its freshest ready dataset and the URLs
+// to render it.
+func (h *LandscapeHandler) results(w http.ResponseWriter, r *http.Request) {
+	results, err := h.svc.Results(r.Context())
+	if err != nil {
+		respondDomainError(w, err)
+		return
+	}
+	httputil.WriteJSON(w, http.StatusOK, results)
+}