Rename backend code references: Bookmann → Bookhoard

Backend changes:
- Update import paths: bookmann/internal → bookhoard/internal
- Rename struct fields: BookmannUUID → BookhoardUUID
- Update handler function names: mapContentIdToBookmannUUID → mapContentIdToBookhoardUUID
- Update HTTP response headers: X-Bookmann-* → X-Bookhoard-*
- Update service and middleware references
- Update main.go imports and references

This is part 2 of the project rename to Bookhoard.

internal/services/book_matching.go

@@ -1,7 +1,7 @@
 package services
 
 import (
-	"bookmann/internal/database"
+	"bookhoard/internal/database"
 	"context"
 	"fmt"
 	"math"
@@ -13,7 +13,7 @@ import (
 // BookMatch represents a potential match with confidence score
 type BookMatch struct {
 	MediaItemID  uuid.UUID `json:"media_item_id"`
-	BookmannUUID uuid.UUID `json:"bookmann_uuid"`
+	BookhoardUUID uuid.UUID `json:"bookhoard_uuid"`
 	Confidence   float64   `json:"confidence"`
 	MatchMethod  string    `json:"match_method"`
 }
@@ -61,7 +61,7 @@ func (s *BookMatchingService) QueryBooks(ctx context.Context, req *BookQueryRequ
 	var matches []BookMatch
 
 	// Priority 1: Bookmann UUID (canonical) - Confidence: 1.0
-	if match := s.matchByBookmannUUID(ctx, req.Identifiers); match != nil {
+	if match := s.matchByBookhoardUUID(ctx, req.Identifiers); match != nil {
 		matches = append(matches, *match)
 	}
 
@@ -113,8 +113,8 @@ func (s *BookMatchingService) QueryBooks(ctx context.Context, req *BookQueryRequ
 	}, nil
 }
 
-// matchByBookmannUUID attempts to match by Bookmann UUID
-func (s *BookMatchingService) matchByBookmannUUID(ctx context.Context, identifiers []string) *BookMatch {
+// matchByBookhoardUUID attempts to match by Bookmann UUID
+func (s *BookMatchingService) matchByBookhoardUUID(ctx context.Context, identifiers []string) *BookMatch {
 	for _, id := range identifiers {
 		if len(id) > 4 && id[:4] == "uuid:" {
 			uuidStr := id[5:]
@@ -129,7 +129,7 @@ func (s *BookMatchingService) matchByBookmannUUID(ctx context.Context, identifie
 				mediaUUID := item.ID.Bytes
 				return &BookMatch{
 					MediaItemID:  mediaUUID,
-					BookmannUUID: mediaUUID,
+					BookhoardUUID: mediaUUID,
 					Confidence:   1.0,
 					MatchMethod:  "uuid_match",
 				}
@@ -156,7 +156,7 @@ func (s *BookMatchingService) matchByOPFUUID(ctx context.Context, identifiers []
 				if item.OpfUuid.Valid && item.OpfUuid.String == uuidStr {
 					return &BookMatch{
 						MediaItemID:  item.ID.Bytes,
-						BookmannUUID: item.ID.Bytes,
+						BookhoardUUID: item.ID.Bytes,
 						Confidence:   0.95,
 						MatchMethod:  "opf_uuid_match",
 					}
@@ -181,7 +181,7 @@ func (s *BookMatchingService) matchBySHA256(ctx context.Context, sha256 string)
 		if item.FileSha256.Valid && item.FileSha256.String == sha256 {
 			return &BookMatch{
 				MediaItemID:  item.ID.Bytes,
-				BookmannUUID: item.ID.Bytes,
+				BookhoardUUID: item.ID.Bytes,
 				Confidence:   0.9,
 				MatchMethod:  "sha256_match",
 			}
@@ -207,7 +207,7 @@ func (s *BookMatchingService) matchByOPFIdentifier(ctx context.Context, identifi
 				if item.OpfIdentifier.Valid && item.OpfIdentifier.String == identifier {
 					return &BookMatch{
 						MediaItemID:  item.ID.Bytes,
-						BookmannUUID: item.ID.Bytes,
+						BookhoardUUID: item.ID.Bytes,
 						Confidence:   0.85,
 						MatchMethod:  "opf_identifier_match",
 					}
@@ -235,7 +235,7 @@ func (s *BookMatchingService) matchByISBNASIN(ctx context.Context, identifiers [
 				if item.Isbn.Valid && item.Isbn.String == isbn {
 					return &BookMatch{
 						MediaItemID:  item.ID.Bytes,
-						BookmannUUID: item.ID.Bytes,
+						BookhoardUUID: item.ID.Bytes,
 						Confidence:   0.8,
 						MatchMethod:  "isbn_match",
 					}
@@ -257,7 +257,7 @@ func (s *BookMatchingService) matchByISBNASIN(ctx context.Context, identifiers [
 				if item.Asin.Valid && item.Asin.String == asin {
 					return &BookMatch{
 						MediaItemID:  item.ID.Bytes,
-						BookmannUUID: item.ID.Bytes,
+						BookhoardUUID: item.ID.Bytes,
 						Confidence:   0.8,
 						MatchMethod:  "asin_match",
 					}
@@ -293,7 +293,7 @@ func (s *BookMatchingService) matchByTitleAuthorSize(ctx context.Context, title,
 		if titleMatch && authorMatch && sizeMatch {
 			matches = append(matches, BookMatch{
 				MediaItemID:  item.ID.Bytes,
-				BookmannUUID: item.ID.Bytes,
+				BookhoardUUID: item.ID.Bytes,
 				Confidence:   0.5,
 				MatchMethod:  "title_author_size_match",
 			})
@@ -319,7 +319,7 @@ func (s *BookMatchingService) matchByTitleOnly(ctx context.Context, title string
 		if item.Title == title {
 			matches = append(matches, BookMatch{
 				MediaItemID:  item.ID.Bytes,
-				BookmannUUID: item.ID.Bytes,
+				BookhoardUUID: item.ID.Bytes,
 				Confidence:   0.3,
 				MatchMethod:  "title_match",
 			})