Implement WOPI integration for Collabora Online

- Add WOPI models (CheckFileInfoResponse, PutFileResponse, LockInfo)
- Implement WOPI handlers: CheckFileInfo, GetFile, PutFile, Lock operations
- Add file locking mechanism to prevent concurrent editing conflicts
- Add WOPI session endpoint for generating access tokens
- Add UpdateFileSize method to database
- Add WOPI routes (/wopi/files/* endpoints)
- Update Flutter document viewer to load Collabora via WOPI WOPISrc URL
- Implement WebView integration for Collabora Online viewer
- Add comprehensive logging for WOPI operations [WOPI-TOKEN], [WOPI-REQUEST], [WOPI-STORAGE], [WOPI-LOCK]

go_cloud/internal/models/wopi.go

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+package models
+package models
+
+import "time"
+
+// WOPICheckFileInfoResponse represents the response to WOPI CheckFileInfo request
+// Reference: https://docs.microsoft.com/en-us/openspecs/office_protocols/ms-wopi/4b8ffc3f-e8a6-4169-8c4e-34924ac6ae2f
+type WOPICheckFileInfoResponse struct {
+	BaseFileName                    string    `json:"BaseFileName"`
+	Size                           int64     `json:"Size"`
+	Version                        string    `json:"Version"`
+	OwnerId                        string    `json:"OwnerId"`
+	UserId                         string    `json:"UserId"`
+	UserFriendlyName               string    `json:"UserFriendlyName"`
+	UserCanWrite                   bool      `json:"UserCanWrite"`
+	UserCanRename                  bool      `json:"UserCanRename"`
+	UserCanNotWriteRelative        bool      `json:"UserCanNotWriteRelative"`
+	ReadOnly                       bool      `json:"ReadOnly"`
+	RestrictedWebViewOnly          bool      `json:"RestrictedWebViewOnly"`
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+}	AccessToken string `json:"access_token"`	WOPISrc     string `json:"wopi_src"`type WOPISessionResponse struct {// WOPISessionResponse represents a response for creating a WOPI session}	ClosePostMessage bool   `json:"close_post_message"`	BootstrapperUrl  string `json:"bootstrapper_url,omitempty"`	AccessTokenTTL   int64  `json:"access_token_ttl"`	AccessToken      string `json:"access_token"`type WOPIAccessTokenResponse struct {// WOPIAccessTokenResponse represents a response with WOPI access token}	FileID string `json:"file_id"`type WOPIAccessTokenRequest struct {// WOPIAccessTokenRequest represents a request to get WOPI access token}	ExpiresAt time.Time `json:"expires_at"`	CreatedAt time.Time `json:"created_at"`	LockID    string    `json:"lock_id"`	UserID    string    `json:"user_id"`	FileID    string    `json:"file_id"`type WOPILockInfo struct {// WOPILockInfo represents information about a file lock}	ItemVersion string `json:"ItemVersion"`type WOPIPutFileResponse struct {// WOPIPutFileResponse represents the response to WOPI PutFile request}	DownloadUrl                    string    `json:"DownloadUrl,omitempty"`	FileSharingUrl                 string    `json:"FileSharingUrl,omitempty"`	ViewUrl                        string    `json:"ViewUrl,omitempty"`	EditUrl                        string    `json:"EditUrl,omitempty"`	CloseUrl                       string    `json:"CloseUrl,omitempty"`	TimeZone                       string    `json:"TimeZone"`	IsAnonymousUser                bool      `json:"IsAnonymousUser"`	LastModifiedTime               string    `json:"LastModifiedTime"`	SupportsScenarios              []string  `json:"SupportsScenarios"`	SupportsFolders                bool      `json:"SupportsFolders"`	SupportsRenameRelativeToFolder bool      `json:"SupportsRenameRelativeToFolder"`	SupportsRename                 bool      `json:"SupportsRename"`	SupportsDelete                 bool      `json:"SupportsDelete"`	SupportsGetLock                bool      `json:"SupportsGetLock"`	SupportsExtendedLockLength     bool      `json:"SupportsExtendedLockLength"`	SupportsLocks                  bool      `json:"SupportsLocks"`	SupportsCobalt                 bool      `json:"SupportsCobalt"`	SupportsUpdate                 bool      `json:"SupportsUpdate"`	EnableOwnerTermination         bool      `json:"EnableOwnerTermination"`	UserCanCreateRelativeToFolder  bool      `json:"UserCanCreateRelativeToFolder"`