Update documentation and API tests: Bookmann → Bookhoard

Documentation updates:
- All docs/ files: Update project references
- Bruno API collection: Update collection name and tests
- Device setup guides: Update all examples
- Implementation plan: Update database schema examples
- README files: Update project references

Part of project rename to Bookhoard.

docs/TESTING.md

@@ -57,7 +57,7 @@ cmd/server/tests/
    export DATABASE_PASSWORD=postgres
 
    # Option 2: Use DATABASE_URL for containerized testing
-   export DATABASE_URL="postgresql://user:pass@localhost:5432/bookmann"
+   export DATABASE_URL="postgresql://user:pass@localhost:5432/bookhoard"
    ```
 
 2. **Dependencies**: Ensure all Go dependencies are installed
@@ -95,8 +95,8 @@ go test -v -run TestAnalyticsReadingStats
 ```bash
 # Build and run tests in Docker container
 podman-compose up -d db
-podman build -t bookmann-test .
-podman run --network bookmann_default -e DATABASE_URL="postgresql://postgres:postgres@db:5432/bookmann" bookmann-test go test ./cmd/server/tests/ -v
+podman build -t bookhoard-test .
+podman run --network bookhoard_default -e DATABASE_URL="postgresql://postgres:postgres@db:5432/bookhoard" bookhoard-test go test ./cmd/server/tests/ -v
 ```
 
 ### Test Modes
@@ -452,7 +452,7 @@ jobs:
       postgres:
         image: postgres:15
         env:
-          POSTGRES_DB: bookmann
+          POSTGRES_DB: bookhoard
           POSTGRES_USER: postgres
           POSTGRES_PASSWORD: postgres
         options: >-
@@ -469,7 +469,7 @@ jobs:
 
       - name: Run integration tests
         env:
-          DATABASE_URL: postgresql://postgres:postgres@localhost:5432/bookmann
+          DATABASE_URL: postgresql://postgres:postgres@localhost:5432/bookhoard
         run: |
           cd cmd/server/tests
           go test -v -race -coverprofile=coverage.out