Add quick_ideas skill and job for Quick dinners (Feature 18)

quick_ideas v1 suggests Quick dinners of one kind, crockpot or under30,
from the household context, never returning a name already shown: the
exclude list is checked against normalized names with harness.Similar.
POST /api/v1/ideas/quick {kind, exclude[]} validates both fields (no
default kind) and answers 202 {jobId}; the quick_ideas job asks for 12
ideas, grounds them through the same GroundEach rounds as
ideas_from_ingredients and keeps up to 6 whose grounded recipe is of the
kind (crockpot: method crockpot; under30: minutes_total <= 30), so the
model's estimate never decides. Fewer survivors make a shorter page,
never a padded one.

The grounding loop, failure clearing and failed-result view are now
shared generic helpers used by both idea jobs rather than a second copy.

Maestro task 243a6812-f52b-4215-a4a2-8eb599914f7e.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/server/ideas.go

@@ -8,7 +8,7 @@ import (
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/ideas"
 )
 
-// maxIdeasBody bounds a POST /ideas/from-ingredients body.
+// maxIdeasBody bounds a POST /ideas/from-ingredients or /ideas/quick body.
 const maxIdeasBody = 16 << 10
 
 // ideasFromIngredients is the POST /ideas/from-ingredients body. Both
@@ -51,3 +51,45 @@ func postIdeasFromIngredients(logger *slog.Logger, svc *ideas.Service) http.Hand
 		writeJSON(w, r, logger, http.StatusAccepted, started)
 	}
 }
+
+// ideasQuick is the POST /ideas/quick body. Both fields are required:
+// exclude is [] on a first page.
+type ideasQuick struct {
+	Kind    *string  `json:"kind"`
+	Exclude []string `json:"exclude"`
+}
+
+// postIdeasQuick starts finding a page of Quick dinner ideas of a kind,
+// crockpot or under30, none named in exclude, and answers 202 with the
+// jobId that GET /jobs/{id} reports on, without waiting for the job. A
+// missing or unknown kind, or an exclude list the household must correct,
+// is 400.
+func postIdeasQuick(logger *slog.Logger, svc *ideas.Service) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		body, err := decodePatch[ideasQuick](http.MaxBytesReader(w, r.Body, maxIdeasBody))
+		if err != nil {
+			writeError(w, r, logger, http.StatusBadRequest, "invalid_request", err.Error())
+			return
+		}
+		switch {
+		case body.Kind == nil:
+			writeError(w, r, logger, http.StatusBadRequest, "invalid_request", "kind: required")
+			return
+		case body.Exclude == nil:
+			writeError(w, r, logger, http.StatusBadRequest, "invalid_request", "exclude: required")
+			return
+		}
+		started, err := svc.StartQuick(r.Context(), *body.Kind, body.Exclude)
+		var invalid *ideas.InvalidError
+		switch {
+		case errors.As(err, &invalid):
+			writeError(w, r, logger, http.StatusBadRequest, "invalid_request", invalid.Message)
+			return
+		case err != nil:
+			logger.ErrorContext(r.Context(), "start quick ideas", "error", err)
+			writeError(w, r, logger, http.StatusInternalServerError, "internal", "internal error")
+			return
+		}
+		writeJSON(w, r, logger, http.StatusAccepted, started)
+	}
+}