Add garden objects backend: polymorphic CRUD + /full (#10)

Garden objects (beds, bags, containers, in-ground, trees, paths,
structures) in one polymorphic table, following the #7 service
conventions.

- store/objects.go: scanObject + Create (RETURNING), Get, ListForGarden
  (z_index order), version-guarded Update (RETURNING, returns current row
  on conflict), Delete (plantings cascade via FK).
- store/plantings.go + plants.go: the read side /full needs now —
  ListActivePlantingsForGarden (removed_at IS NULL) and
  ListReferencedPlants (distinct plants used by active plantings). Both
  return empty until #14 adds plantings; #12/#14 extend these files.
- service/objects.go: Create/Update(partial patch)/Delete/GardenFull, all
  (ctx, actorID, ...) through requireGardenRole(editor for mutations,
  viewer for /full). finalizeObject validates kind + shape (rect/circle;
  polygon reserved), finite dims in [1cm,100m], NaN/Inf rejection, loose
  bbox-overlaps-garden placement (partial overhang OK), hex color, valid
  JSON props, name/notes caps; normalizes rotation to [0,360). Plantable
  defaults by kind, overridable.
- api/objects.go: POST /gardens/:id/objects, PATCH/DELETE /objects/:id,
  GET /gardens/:id/full ({garden,objects,plantings,plants}). props is any
  JSON value stored as text; PATCH is partial + required version, 409
  returns the current row.

Tests: service (defaults, plantable-by-kind, rotation normalize,
validation rejects incl. off-field/polygon/bad-color/bad-props, partial
patch + version conflict, cross-user ErrNotFound, delete, /full shape) and
api (CRUD + /full, 409 envelope, cross-user 404, polygon/no-kind 400,
props round-trip).

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
Claude-Session: https://claude.ai/code/session_01JdQpdYYsTgtkJBxbcpAszi

internal/api/objects.go

@@ -0,0 +1,150 @@
+package api
+
+import (
+	"encoding/json"
+	"errors"
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+
+	"gitea.stevedudenhoeffer.com/steve/pansy/internal/domain"
+	"gitea.stevedudenhoeffer.com/steve/pansy/internal/service"
+)
+
+// objectCreateRequest is the body for POST /gardens/:id/objects. Dimensions are
+// centimeters; the object is positioned by its center. Plantable/color/props are
+// optional (plantable defaults by kind). props is any JSON value, stored as-is.
+type objectCreateRequest struct {
+	Kind        string          `json:"kind" binding:"required"`
+	Name        string          `json:"name"`
+	Shape       string          `json:"shape"`
+	XCM         float64         `json:"xCm"`
+	YCM         float64         `json:"yCm"`
+	WidthCM     float64         `json:"widthCm"`
+	HeightCM    float64         `json:"heightCm"`
+	RotationDeg float64         `json:"rotationDeg"`
+	ZIndex      int             `json:"zIndex"`
+	Plantable   *bool           `json:"plantable"`
+	Color       *string         `json:"color"`
+	Props       json.RawMessage `json:"props"`
+	Notes       string          `json:"notes"`
+}
+
+// objectUpdateRequest is the body for PATCH /objects/:id: every field optional
+// (absent = unchanged), plus the required current version. Kind and shape are
+// immutable and not accepted.
+type objectUpdateRequest struct {
+	Name        *string         `json:"name"`
+	XCM         *float64        `json:"xCm"`
+	YCM         *float64        `json:"yCm"`
+	WidthCM     *float64        `json:"widthCm"`
+	HeightCM    *float64        `json:"heightCm"`
+	RotationDeg *float64        `json:"rotationDeg"`
+	ZIndex      *int            `json:"zIndex"`
+	Plantable   *bool           `json:"plantable"`
+	Color       *string         `json:"color"`
+	Props       json.RawMessage `json:"props"`
+	Notes       *string         `json:"notes"`
+	Version     int64           `json:"version" binding:"required,min=1"`
+}
+
+// propsFromRaw maps a JSON props value to the stored *string: a present, non-null
+// value becomes its JSON text; absent or null becomes nil (leave/none).
+func propsFromRaw(raw json.RawMessage) *string {
+	if len(raw) == 0 || string(raw) == "null" {
+		return nil
+	}
+	s := string(raw)
+	return &s
+}
+
+func (h *handlers) createObject(c *gin.Context) {
+	gardenID, ok := parseIDParam(c, "id")
+	if !ok {
+		return
+	}
+	var req objectCreateRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		writeAPIError(c, http.StatusBadRequest, "INVALID_INPUT", "kind is required")
+		return
+	}
+	o, err := h.svc.CreateObject(c.Request.Context(), mustActor(c).ID, gardenID, service.ObjectInput{
+		Kind:        req.Kind,
+		Name:        req.Name,
+		Shape:       req.Shape,
+		XCM:         req.XCM,
+		YCM:         req.YCM,
+		WidthCM:     req.WidthCM,
+		HeightCM:    req.HeightCM,
+		RotationDeg: req.RotationDeg,
+		ZIndex:      req.ZIndex,
+		Plantable:   req.Plantable,
+		Color:       req.Color,
+		Props:       propsFromRaw(req.Props),
+		Notes:       req.Notes,
+	})
+	if err != nil {
+		writeServiceError(c, err)
+		return
+	}
+	c.JSON(http.StatusCreated, o)
+}
+
+func (h *handlers) updateObject(c *gin.Context) {
+	id, ok := parseIDParam(c, "id")
+	if !ok {
+		return
+	}
+	var req objectUpdateRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		writeAPIError(c, http.StatusBadRequest, "INVALID_INPUT", "a current version is required")
+		return
+	}
+	o, err := h.svc.UpdateObject(c.Request.Context(), mustActor(c).ID, id, service.ObjectPatch{
+		Name:        req.Name,
+		XCM:         req.XCM,
+		YCM:         req.YCM,
+		WidthCM:     req.WidthCM,
+		HeightCM:    req.HeightCM,
+		RotationDeg: req.RotationDeg,
+		ZIndex:      req.ZIndex,
+		Plantable:   req.Plantable,
+		Color:       req.Color,
+		Props:       propsFromRaw(req.Props),
+		Notes:       req.Notes,
+	}, req.Version)
+	if err != nil {
+		if errors.Is(err, domain.ErrVersionConflict) {
+			writeVersionConflict(c, o)
+			return
+		}
+		writeServiceError(c, err)
+		return
+	}
+	c.JSON(http.StatusOK, o)
+}
+
+func (h *handlers) deleteObject(c *gin.Context) {
+	id, ok := parseIDParam(c, "id")
+	if !ok {
+		return
+	}
+	if err := h.svc.DeleteObject(c.Request.Context(), mustActor(c).ID, id); err != nil {
+		writeServiceError(c, err)
+		return
+	}
+	c.Status(http.StatusNoContent)
+}
+
+func (h *handlers) gardenFull(c *gin.Context) {
+	gardenID, ok := parseIDParam(c, "id")
+	if !ok {
+		return
+	}
+	full, err := h.svc.GardenFull(c.Request.Context(), mustActor(c).ID, gardenID)
+	if err != nil {
+		writeServiceError(c, err)
+		return
+	}
+	c.JSON(http.StatusOK, full)
+}