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).

.goreleaser.yaml

@@ -13,11 +13,14 @@ builds:
   - main: ./cmd/uptop
     binary: uptop
     env:
-      - CGO_ENABLED=1
+      - CGO_ENABLED=0
     goos:
       - linux
+      - darwin
+      - windows
     goarch:
       - amd64
+      - arm64
     ldflags:
       - -s -w
       - -X main.version={{ .Version }}
@@ -29,6 +32,9 @@ builds:
 archives:
   - formats: [tar.gz]
     name_template: "{{ .ProjectName }}_{{ .Os }}_{{ .Arch }}"
+    format_overrides:
+      - goos: windows
+        formats: [zip]
 
 checksum:
   name_template: checksums.txt
@@ -52,22 +58,5 @@ nfpms:
         dst: /usr/share/doc/uptop/LICENSE
         type: doc
 
-homebrew_casks:
-  - name: uptop
-    homepage: https://gitea.lerkolabs.com/lerkolabs/uptop
-    description: Self-hosted uptime monitoring with a TUI over SSH
-    directory: Casks
-    skip_upload: true
-    commit_msg_template: "update uptop to {{ .Tag }}"
-    url:
-      template: "https://gitea.lerkolabs.com/lerkolabs/uptop/releases/download/{{ .Tag }}/{{ .ArtifactName }}"
-    repository:
-      owner: lerkolabs
-      name: homebrew-tap
-      git:
-        url: "ssh://git@gitea.lerkolabs.com:2222/lerkolabs/homebrew-tap.git"
-        private_key: "{{ if index .Env \"TAP_SSH_KEY\" }}{{ .Env.TAP_SSH_KEY }}{{ end }}"
-        ssh_command: "ssh -o StrictHostKeyChecking=accept-new"
-
 changelog:
   disable: true