update docs

docs/data/en/atlas.md

@@ -31,10 +31,10 @@ Core books live in `soleprint/atlas/books/`. Room-specific books live in `cfg/<r
 At build time, room-specific books are merged into the output:
 
 ```
-soleprint/atlas/books/        # Core books (all rooms)
-cfg/amar/atlas/books/         # Amar-specific books
+soleprint/atlas/books/             # Core books (all rooms)
+cfg/<room>/atlas/books/            # Room-specific books
          ↓ build.py
-gen/amar/soleprint/atlas/books/   # Merged output
+gen/<room>/soleprint/atlas/books/  # Merged output
 ```
 
 Core books ship with every room. Room books add to or override them. The build copies the core first, then overlays the room-specific content.

docs/data/en/concepts.md

@@ -11,7 +11,6 @@ A room is an isolated configuration. Each room lives in `cfg/<room>/` and contai
 ```
 cfg/
   standalone/    # Soleprint only, no managed app
-  amar/          # Soleprint wrapping the Amar application
   myroom/        # Your room
 ```
 

docs/data/en/station-datagen.md

@@ -28,7 +28,7 @@ Rooms subclass a base generator and provide domain-specific data factories:
 ```python
 from station.tools.datagen.base import BaseGenerator
 
-class AmarDataGenerator(BaseGenerator):
+class RoomDataGenerator(BaseGenerator):
     def generate_customers(self, count=10):
         return [self.fake_customer() for _ in range(count)]