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>

internal/client/client.go

@@ -0,0 +1,71 @@
+// Copyright (c) EZSCALE.
+// SPDX-License-Identifier: MPL-2.0
+
+package client
+
+import (
+	"fmt"
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+)
+
+// Client is the VirtFusion API client.
+type Client struct {
+	BaseURL    string
+	Token      string
+	HTTPClient *http.Client
+}
+
+// New creates a new VirtFusion API client.
+// The endpoint can be a hostname (e.g. "cp.example.com") or a full URL
+// (e.g. "https://cp.example.com" or "https://cp.example.com/api/v1").
+func New(endpoint, token string) (*Client, error) {
+	if endpoint == "" {
+		return nil, fmt.Errorf("endpoint is required")
+	}
+	if token == "" {
+		return nil, fmt.Errorf("api_token is required")
+	}
+
+	baseURL := normalizeEndpoint(endpoint)
+
+	return &Client{
+		BaseURL: baseURL,
+		Token:   token,
+		HTTPClient: &http.Client{
+			Timeout: 60 * time.Second,
+		},
+	}, nil
+}
+
+// normalizeEndpoint takes a user-provided endpoint and returns a full base URL
+// ending with /api/v1. Supports:
+//   - "cp.example.com" → "https://cp.example.com/api/v1"
+//   - "https://cp.example.com" → "https://cp.example.com/api/v1"
+//   - "https://cp.example.com/api/v1" → "https://cp.example.com/api/v1"
+func normalizeEndpoint(endpoint string) string {
+	endpoint = strings.TrimRight(endpoint, "/")
+
+	// If no scheme, add https://
+	if !strings.Contains(endpoint, "://") {
+		endpoint = "https://" + endpoint
+	}
+
+	// Parse to validate
+	u, err := url.Parse(endpoint)
+	if err != nil {
+		// Fall back to simple construction
+		return endpoint + "/api/v1"
+	}
+
+	// If path already ends with /api/v1, use as-is
+	if strings.HasSuffix(u.Path, "/api/v1") {
+		return u.String()
+	}
+
+	// Otherwise append /api/v1
+	u.Path = strings.TrimRight(u.Path, "/") + "/api/v1"
+	return u.String()
+}