Initial codebase: Go + Wails amateur radio logbook

Backend (Go 1.25 / Wails v2):
- QSO storage on SQLite (modernc) with embedded migrations (0001..0005)
- Streaming ADIF import (batch insert) + WorkedBefore per callsign and DXCC
- Callsign lookup with QRZ.com + HamQTH providers (primary/failsafe routing)
  and SQLite-backed TTL cache
- DXCC resolver from cty.dat (auto-download, longest-prefix-match)
- Multi-profile operator identities (home/portable/SOTA/contest) — every
  QSO stamps MY_* from the active profile
- CAT control via OmniRig COM on a single OS-locked goroutine, with
  bidirectional sync (freq/mode/band/split/VFOs) and Rig1/Rig2 hot-swap
- Settings store (key/value), CAT debug log at %APPDATA%/HamLog/cat.log

Frontend (React 18 + TypeScript + Tailwind v4 + shadcn-style):
- Single-row entry strip with CAT-aware band/mode/freq, RST, Start/End
  UTC, per-field locks (band/mode/freq/start/end) for backdated QSOs
- Topbar: live freq (MHz.kHz.Hz dotted), live UTC, band/mode/SPLIT badges,
  CAT pill with rig selector and clickable Azimuth pill (rotor TODO)
- Settings tree: Profiles (Log4OM-style manager), Station Information
  (edits the active profile), unified Callsign Lookup with Test buttons,
  Bands/Modes lists, CAT
- Worked-before matrix (band × mode × class) with new-DXCC highlighting
- ADIF import from menu + Maintenance > Refresh cty.dat

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,47 @@
+# --- Build artifacts ---
+build/bin/
+frontend/dist/
+*.exe
+*.dll
+*.so
+*.dylib
+
+# --- Dependencies / generated ---
+node_modules/
+# wailsjs/ is intentionally tracked — generated by `wails generate module`
+# but consumed by the frontend at build time, so committing it spares
+# fresh clones from a mandatory generate step.
+
+# --- Go ---
+*.test
+*.out
+coverage.out
+go.work
+go.work.sum
+
+# --- IDE / editors ---
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# --- OS noise ---
+.DS_Store
+Thumbs.db
+desktop.ini
+
+# --- Local user data (lives in %APPDATA%/HamLog, but safety net) ---
+*.db
+*.db-journal
+*.db-wal
+*.db-shm
+hamlog.db*
+cty.dat
+cat.log
+
+# --- Secrets ---
+.env
+.env.local
+*.pem
+*.key