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>

CLAUDE.md

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+# btcprice
+
+Bitcoin price tracker - Clojure Kit web application.
+
+## Build & Development Commands
+
+- `make run` — Start dev server on port 3000
+- `make repl` — Start nREPL on port 7888
+- `make test` — Run tests
+- `make tailwind` — Watch Tailwind CSS for changes
+- `make uberjar` — Build production JAR
+- `docker compose up -d` — Start PostgreSQL
+
+## REPL Commands
+
+```clojure
+(dev-prep!)   ;; Prepare dev system
+(go)          ;; Start system
+(reset)       ;; Reload code & restart
+(halt)        ;; Stop system
+(reset-db)    ;; Drop & re-migrate database
+(migrate)     ;; Run pending migrations
+(rollback)    ;; Rollback last migration
+(query-fn)    ;; Get database query function
+```
+
+## Architecture
+
+- **Framework:** Kit (Integrant-based)
+- **Server:** Undertow
+- **Routing:** Reitit
+- **Templates:** Hiccup + HTMX
+- **Styling:** Tailwind CSS v4
+- **Database:** PostgreSQL + conman + Migratus
+
+## Source Layout
+
+```
+src/clj/pmagnus/btcprice/
+├── core.clj              # App entry point
+├── config.clj            # System config loader
+└── web/
+    ├── handler.clj       # Ring handler + routes
+    ├── htmx.clj          # page/fragment macros
+    ├── controllers/
+    │   └── health.clj    # Health check
+    ├── middleware/
+    │   ├── core.clj      # Base middleware
+    │   ├── exception.clj # Exception handling
+    │   └── formats.clj   # Content negotiation
+    └── routes/
+        ├── api.clj       # /api routes (JSON)
+        ├── ui.clj        # UI routes (HTML)
+        └── utils.clj     # Route utilities
+```