rewire bootstrap with SQLite, HTTP API, and real polling

bootstrap: SQLite config, HTTP API on :3000, TCP on :2699, poll loops.
http-api: added serve() so bootstrap doesn't depend on axum directly.
polling: reads data sources from config, polls via http-json adapter,
pushes changed widgets to connected clients.

configure via API, e.g.:
  curl -X POST localhost:3000/api/data-sources -H 'Content-Type: application/json' -d '{...}'
  curl -X PUT localhost:3000/api/layout -H 'Content-Type: application/json' -d '{...}'

Cargo.lock

@@ -8,6 +8,12 @@ version = "0.2.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "683d7910e743518b0e34f1186f92494becacb047c7b6bf616c96772180fef923"
 
+[[package]]
+name = "anyhow"
+version = "1.0.102"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7f202df86484c868dbad7eaa557ef785d5c66295e41b460ef922eca0723b842c"
+
 [[package]]
 name = "api-types"
 version = "0.1.0"
@@ -144,10 +150,12 @@ dependencies = [
 name = "bootstrap"
 version = "0.1.0"
 dependencies = [
+ "anyhow",
  "application",
- "config-memory",
+ "config-sqlite",
  "domain",
- "protocol",
+ "http-api",
+ "http-json",
  "tcp-server",
  "tokio",
 ]
@@ -1353,9 +1361,9 @@ dependencies = [
 
 [[package]]
 name = "quick-xml"
-version = "0.37.5"
+version = "0.40.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "331e97a1af0bf59823e6eadffe373d7b27f485be8748f71471c662c1f269b7fb"
+checksum = "2474bd2e5029e7ccb6abb2ba48cf2383a333851dedf495901544281590c7da7f"
 dependencies = [
  "memchr",
  "serde",