refactor(store): swap mattn/go-sqlite3 for modernc.org/sqlite

Pure-Go SQLite driver — no CGO, no C compiler. Enables:
- static binaries (verified: `file` shows statically linked)
- cross-compile to linux/arm64, darwin/amd64+arm64, windows/amd64+arm64
- goreleaser now builds 6 OS/arch targets + windows .zip
- Dockerfile drops gcc/musl-dev, sets CGO_ENABLED=0
- release-binaries drops gcc/musl-dev

Driver name changes sqlite3 → sqlite, DSN pragmas use
_pragma=name(value) format. All tests pass CGO=0 and CGO=1 -race.

Homebrew cask block removed (was skip_upload:true dead config).

go.mod

@@ -13,11 +13,11 @@ require (
 	github.com/lib/pq v1.11.1
 	github.com/lrstanley/bubblezone v1.0.0
 	github.com/mattn/go-isatty v0.0.20
-	github.com/mattn/go-sqlite3 v1.14.33
 	github.com/miekg/dns v1.1.72
 	github.com/prometheus-community/pro-bing v0.8.0
 	golang.org/x/crypto v0.52.0
 	gopkg.in/yaml.v3 v3.0.1
+	modernc.org/sqlite v1.52.0
 )
 
 require (
@@ -49,6 +49,8 @@ require (
 	github.com/muesli/ansi v0.0.0-20230316100256-276c6243b2f6 // indirect
 	github.com/muesli/cancelreader v0.2.2 // indirect
 	github.com/muesli/termenv v0.16.0 // indirect
+	github.com/ncruces/go-strftime v1.0.0 // indirect
+	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
 	github.com/rivo/uniseg v0.4.7 // indirect
 	github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e // indirect
 	golang.org/x/exp v0.0.0-20240719175910-8a7402abbf56 // indirect
@@ -58,4 +60,7 @@ require (
 	golang.org/x/sys v0.45.0 // indirect
 	golang.org/x/text v0.37.0 // indirect
 	golang.org/x/tools v0.44.0 // indirect
+	modernc.org/libc v1.72.3 // indirect
+	modernc.org/mathutil v1.7.1 // indirect
+	modernc.org/memory v1.11.0 // indirect
 )