Split backend into tavolo-platform, tavolo-scopone and tavolo-app packages

Move the game-independent machinery (lobby, live-game store, websocket,
deadline scheduler, match history, leaderboards) into a new
tavolo-platform distribution behind a GameEngine contract, the scopone
scientifico rules plus a platform adapter into tavolo-scopone, and keep
only the composition root in tavolo-app. The three distributions share
the tavolo namespace (PEP 420, kaya-style monorepo).

Match history becomes fully generic: Match carries the engine's result
JSON and MatchPlayer points/details instead of scopone-shaped team
columns (migration 3 backfills existing rows). Lobby creation takes an
opaque per-game options object and websocket actions dispatch to the
session's engine.

Tests: platform suite runs against a DummyEngine toy game, scopone
keeps the rules tests plus new adapter tests, server/tests covers the
wired stack end to end (194 tests, was 143).

server/requirements.txt

@@ -2,13 +2,19 @@
 # This file is autogenerated by pip-compile with Python 3.14
 # by the following command:
 #
-#    pip-compile --allow-unsafe --extra-index-url=https://pypi.org/simple --index-url=https://gitea.woggioni.net/api/packages/woggioni/pypi/simple --no-index --output-file=requirements.txt pyproject.toml
+#    pip-compile --allow-unsafe --extra-index-url=https://pypi.org/simple --index-url=https://gitea.woggioni.net/api/packages/woggioni/pypi/simple --output-file=requirements.txt pyproject.toml
+#
+# NOTE: the tavolo-platform and tavolo-scopone sibling packages are NOT
+# pinned here: they are installed from ./packages in the Dockerfile and in
+# development (pip install -e ./packages/* -e .). All of their third-party
+# dependencies are direct dependencies of tavolo-app, so this lock covers
+# the full closure.
 #
 --index-url https://gitea.woggioni.net/api/packages/woggioni/pypi/simple
 --extra-index-url https://pypi.org/simple
 
 aerich==0.10.1
-    # via tavolo (pyproject.toml)
+    # via tavolo-app (pyproject.toml)
 aiosqlite==0.22.1
     # via tortoise-orm
 anyio==4.15.1
@@ -19,7 +25,7 @@ anyio==4.15.1
 asyncclick==8.4.2.1
     # via aerich
 asyncpg==0.31.0
-    # via tavolo (pyproject.toml)
+    # via tavolo-app (pyproject.toml)
 certifi==2026.7.22
     # via
     #   httpcore
@@ -35,7 +41,7 @@ dictdiffer==0.10.0
 granian==2.8.3
     # via
     #   kaya-rsgi
-    #   tavolo (pyproject.toml)
+    #   tavolo-app (pyproject.toml)
 h11==0.16.0
     # via httpcore
 httpcore==1.0.9
@@ -43,8 +49,8 @@ httpcore==1.0.9
 httpx==0.28.1
     # via
     #   kaya-oidc
-    #   tavolo (pyproject.toml)
-idna==3.19
+    #   tavolo-app (pyproject.toml)
+idna==3.20
     # via
     #   anyio
     #   httpx
@@ -57,46 +63,44 @@ kaya-core==0.0.4
     #   kaya-openapi
     #   kaya-rsgi
     #   kaya-session
-    #   tavolo (pyproject.toml)
+    #   tavolo-app (pyproject.toml)
 kaya-cors==0.0.4
-    # via tavolo (pyproject.toml)
+    # via tavolo-app (pyproject.toml)
 kaya-oidc==0.0.4
-    # via tavolo (pyproject.toml)
+    # via tavolo-app (pyproject.toml)
 kaya-openapi==0.0.4
-    # via tavolo (pyproject.toml)
+    # via tavolo-app (pyproject.toml)
 kaya-rsgi==0.0.4
-    # via tavolo (pyproject.toml)
+    # via tavolo-app (pyproject.toml)
 kaya-session==0.0.4
     # via
     #   kaya-oidc
     #   kaya-session-redis
-    #   tavolo (pyproject.toml)
+    #   tavolo-app (pyproject.toml)
 kaya-session-redis==0.0.4
-    # via tavolo (pyproject.toml)
+    # via tavolo-app (pyproject.toml)
 pwo==0.1.2
     # via
     #   kaya-core
     #   kaya-rsgi
     #   kaya-session
-    #   tavolo (pyproject.toml)
+    #   tavolo-app (pyproject.toml)
 pycparser==3.0
     # via cffi
 pyjwt[crypto]==2.14.0
     # via
     #   kaya-oidc
-    #   tavolo (pyproject.toml)
+    #   tavolo-app (pyproject.toml)
 pypika-tortoise==0.6.5
     # via tortoise-orm
 pyyaml==6.0.3
-    # via tavolo (pyproject.toml)
+    # via tavolo-app (pyproject.toml)
 redis==8.1.0
     # via
     #   kaya-session-redis
-    #   tavolo (pyproject.toml)
+    #   tavolo-app (pyproject.toml)
 tortoise-orm==1.1.8
-    # via
-    #   aerich
-    #   tavolo (pyproject.toml)
+    # via aerich
 typing-extensions==4.16.0
     # via
     #   anyio