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>

internal/db/migrations/0005_profiles.sql

@@ -0,0 +1,30 @@
+-- station_profiles: one row per operating configuration (home, portable,
+-- SOTA, /MM, contest…). The user picks one as active; every QSO stamps
+-- the active profile's MY_* fields. Place reserved for per-profile creds
+-- (LoTW, Clublog, QRZ.com) in a later migration once those exports land.
+CREATE TABLE station_profiles (
+    id              INTEGER PRIMARY KEY AUTOINCREMENT,
+    name            TEXT NOT NULL,                    -- "Home", "Portable", "SOTA"…
+    callsign        TEXT NOT NULL DEFAULT '',
+    operator        TEXT NOT NULL DEFAULT '',
+    my_grid         TEXT NOT NULL DEFAULT '',
+    my_country      TEXT NOT NULL DEFAULT '',
+    my_state        TEXT NOT NULL DEFAULT '',
+    my_cnty         TEXT NOT NULL DEFAULT '',
+    my_street       TEXT NOT NULL DEFAULT '',
+    my_city         TEXT NOT NULL DEFAULT '',
+    my_postal_code  TEXT NOT NULL DEFAULT '',
+    my_sota_ref     TEXT NOT NULL DEFAULT '',
+    my_pota_ref     TEXT NOT NULL DEFAULT '',
+    my_rig          TEXT NOT NULL DEFAULT '',
+    my_antenna      TEXT NOT NULL DEFAULT '',
+    tx_pwr          REAL,                              -- nullable: not always known
+    is_active       INTEGER NOT NULL DEFAULT 0,        -- 1 for the currently-selected profile
+    sort_order      INTEGER NOT NULL DEFAULT 0,
+    created_at      TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ','now')),
+    updated_at      TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ','now'))
+);
+
+-- Only one profile can be active at a time. Enforced lazily — the Go side
+-- clears all then sets one before each switch.
+CREATE INDEX idx_station_profiles_active ON station_profiles(is_active);