refactor: move TodoMVC example into example/ directory

- example/todomvc/pocketbook/todomvc.cljs — app source
- example/todomvc/todomvc.html — page
- example/todomvc/js/ — compiled output (gitignored)

Server static file serving is now filesystem-based via --static-dir
flag instead of classpath resources. No static dir by default (API
only); bb server passes --static-dir example/todomvc.

Removed resources/public/ — library has no bundled static assets.

deps.edn

@@ -1,4 +1,4 @@
-{:paths ["src" "resources"]
+{:paths ["src"]
  :deps  {org.clojure/clojure          {:mvn/version "1.12.0"}
          http-kit/http-kit             {:mvn/version "2.8.0"}
          com.cognitect/transit-clj     {:mvn/version "1.0.333"}
@@ -15,12 +15,14 @@
   :server {:main-opts ["-m" "pocketbook.server"]}
 
   ;; ClojureScript client build
-  :cljs   {:extra-deps {org.clojure/clojurescript {:mvn/version "1.11.132"}
+  :cljs   {:extra-paths ["example/todomvc"]
+           :extra-deps {org.clojure/clojurescript {:mvn/version "1.11.132"}
                          com.cognitect/transit-cljs {:mvn/version "0.8.280"}
                          org.clojure/core.async     {:mvn/version "1.7.701"}}
            :main-opts  ["-m" "cljs.main" "-co" "build.edn" "-c"]}
 
-  :cljs-dev {:extra-deps {org.clojure/clojurescript {:mvn/version "1.11.132"}
+  :cljs-dev {:extra-paths ["example/todomvc"]
+             :extra-deps {org.clojure/clojurescript {:mvn/version "1.11.132"}
                            com.cognitect/transit-cljs {:mvn/version "0.8.280"}
                            org.clojure/core.async     {:mvn/version "1.7.701"}}
              :main-opts  ["-m" "cljs.main" "-co" "build.edn" "-w" "src" "-c"]}}}