refactor: use pinned golangci-lint Docker image for linting

Refactor Dockerfile to use a separate lint stage with a pinned
golangci-lint v2.11.3 Docker image instead of installing
golangci-lint via curl in the builder stage. This follows the
pattern used by sneak/pixa.

Changes:
- Dockerfile: separate lint stage using golangci/golangci-lint:v2.11.3
  (Debian-based, pinned by sha256) with COPY --from=lint dependency
- Bump Go from 1.24 to 1.26.1 (golang:1.26.1-bookworm, pinned)
- Bump golangci-lint from v1.64.8 to v2.11.3
- Migrate .golangci.yml from v1 to v2 format (same linters, format only)
- All Docker images pinned by sha256 digest
- Fix all lint issues from the v2 linter upgrade:
  - Add package comments to all packages
  - Add doc comments to all exported types, functions, and methods
  - Fix unchecked errors (errcheck)
  - Fix unused parameters (revive)
  - Fix gosec warnings (MaxBytesReader for form parsing)
  - Fix staticcheck suggestions (fmt.Fprintf instead of WriteString)
  - Rename DeliveryTask to Task to avoid stutter (delivery.Task)
  - Rename shadowed builtin 'max' parameter
- Update README.md version requirements

internal/database/model_event.go

@@ -4,17 +4,17 @@ package database
 type Event struct {
 	BaseModel
 
-	WebhookID    string `gorm:"type:uuid;not null" json:"webhook_id"`
-	EntrypointID string `gorm:"type:uuid;not null" json:"entrypoint_id"`
+	WebhookID    string `gorm:"type:uuid;not null" json:"webhookId"`
+	EntrypointID string `gorm:"type:uuid;not null" json:"entrypointId"`
 
 	// Request data
-	Method      string `gorm:"not null" json:"method"`
-	Headers     string `gorm:"type:text" json:"headers"` // JSON
-	Body        string `gorm:"type:text" json:"body"`
-	ContentType string `json:"content_type"`
+	Method      string `gorm:"not null"    json:"method"`
+	Headers     string `gorm:"type:text"   json:"headers"` // JSON
+	Body        string `gorm:"type:text"   json:"body"`
+	ContentType string `json:"contentType"`
 
 	// Relations
-	Webhook    Webhook    `json:"webhook,omitempty"`
-	Entrypoint Entrypoint `json:"entrypoint,omitempty"`
+	Webhook    Webhook    `json:"webhook,omitzero"`
+	Entrypoint Entrypoint `json:"entrypoint,omitzero"`
 	Deliveries []Delivery `json:"deliveries,omitempty"`
 }