Overhaul VirtFusion provider: 20 resources, 30 data sources, multipage pagination

Complete rewrite of the VirtFusion Terraform provider with full API coverage:

- 20 managed resources (server, build, SSH key, user, firewall, IP blocks, etc.)
- 30 data sources (hypervisors, packages, servers, IP blocks, self-service, etc.)
- New HTTP client with proper error handling, query parameter support, and
  automatic multipage pagination via GetAllPages (fetches all pages from
  Laravel-style paginated endpoints and merges into a single response)
- Fixed type mismatches against live API: ServerData.Suspended (int→bool),
  IPBlockData.Type (string→int), PackageData json tags (primaryStorage, etc.),
  ServerData nested CPU/Settings/Resources structure, HypervisorGroupResources
  array response
- Configurable results-per-page (default 300) on all list data sources
- Migrated CI from GitHub Actions to Gitea Actions
- Updated goreleaser config, go.mod dependencies, and examples

Verified against live VirtFusion instance at cp.vps.ezscale.tech:
all data sources return correct data with full pagination support.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.golangci.yml

@@ -1,5 +1,3 @@
-# Visit https://golangci-lint.run/ for usage documentation
-# and information on other useful linters
 issues:
   max-per-linter: 0
   max-same-issues: 0
@@ -9,13 +7,11 @@ linters:
   enable:
     - durationcheck
     - errcheck
-    - exportloopref
     - forcetypeassert
     - godot
     - gofmt
     - gosimple
     - ineffassign
-    - makezero
     - misspell
     - nilerr
     - predeclared
@@ -24,4 +20,4 @@ linters:
     - unconvert
     - unparam
     - unused
-    - vet
+    - vet