Rename the app from scopa to tavolo

The platform now hosts multiple card games, with scopone scientifico as
the first one. Rename the brand wherever it is not a game rule:

- move the Python package to server/src/tavolo and update imports
- rename the Postgres database/user, OIDC issuer path, client id and
  Redis key prefixes to tavolo (clean break: existing pgdata volumes and
  live games are not migrated)
- rename the Cargo package to tavolo-web and set the page title to Tavolo
- update docs and the Docker image path to woggioni/tavolo

The scopa game term (clearing the table) in the engine, state and web UI
is intentionally left untouched.

web/Cargo.lock

@@ -369,24 +369,6 @@ version = "1.0.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf54715a573b99ac80df0bc206da022bcd442c974952c7b9720069370852e21f"
 
-[[package]]
-name = "scopa-web"
-version = "0.1.0"
-dependencies = [
- "console_error_panic_hook",
- "futures",
- "gloo-net",
- "gloo-timers",
- "js-sys",
- "serde",
- "serde_json",
- "sycamore",
- "sycamore-router",
- "wasm-bindgen",
- "wasm-bindgen-futures",
- "web-sys",
-]
-
 [[package]]
 name = "serde"
 version = "1.0.229"
@@ -579,6 +561,24 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "tavolo-web"
+version = "0.1.0"
+dependencies = [
+ "console_error_panic_hook",
+ "futures",
+ "gloo-net",
+ "gloo-timers",
+ "js-sys",
+ "serde",
+ "serde_json",
+ "sycamore",
+ "sycamore-router",
+ "wasm-bindgen",
+ "wasm-bindgen-futures",
+ "web-sys",
+]
+
 [[package]]
 name = "thiserror"
 version = "1.0.69"