add config-sqlite and http-api adapters

SQLite config store: full ConfigRepository impl with JSON serialization
for mappings, layouts, data source configs. 12 integration tests.

HTTP API: Axum REST endpoints for widgets, data sources, layout, presets.
6 integration tests using tower::oneshot.

Port traits updated to return Send futures for Axum compatibility.

Cargo.toml

@@ -9,6 +9,8 @@ members = [
     "crates/adapters/tcp-server",
     "crates/adapters/tcp-client",
     "crates/adapters/display-terminal",
+    "crates/adapters/config-sqlite",
+    "crates/adapters/http-api",
     "crates/bootstrap",
     "crates/client-desktop",
 ]
@@ -27,6 +29,13 @@ config-memory = { path = "crates/adapters/config-memory" }
 tcp-server = { path = "crates/adapters/tcp-server" }
 tcp-client = { path = "crates/adapters/tcp-client" }
 display-terminal = { path = "crates/adapters/display-terminal" }
+config-sqlite = { path = "crates/adapters/config-sqlite" }
+http-api = { path = "crates/adapters/http-api" }
+axum = { version = "0.8", features = ["macros"] }
+tower-http = { version = "0.6", features = ["cors"] }
 serde = { version = "1.0", default-features = false, features = ["derive", "alloc"] }
+serde_json = "1.0"
+sqlx = { version = "0.8", features = ["runtime-tokio-rustls", "sqlite"] }
 postcard = { version = "1.1", default-features = false, features = ["alloc"] }
 tokio = { version = "1.0", features = ["macros", "rt", "rt-multi-thread", "net", "sync", "time", "io-util"] }
+tower = "0.5"