Initial project setup: Clojure Kit web app for BTC price tracking

Kit framework with Undertow, Reitit routing, Hiccup + HTMX templating,
Tailwind CSS v4, PostgreSQL (empty database), and mobile-first index page.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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+{:tasks
+ {:run     {:doc  "Start dev server"
+            :task (shell "clj -M:dev")}
+  :nrepl   {:doc  "Start nREPL"
+            :task (shell "clj -M:dev:nrepl")}
+  :cider   {:doc  "Start CIDER"
+            :task (shell "clj -M:dev:cider")}
+  :test    {:doc  "Run tests"
+            :task (shell "clj -M:test")}
+  :uberjar {:doc  "Build uberjar"
+            :task (shell "clj -T:build all")}
+  :format  {:doc  "Format code"
+            :task (shell "clj -M:dev -m cljstyle.main fix src test")}}}