Add swaggo annotations to all handlers and regenerate full Swagger docs

- Added @Summary/@Router/@Param/@Success/@Security annotations to all API handlers
- Regenerated docs/swagger.json, docs/swagger.yaml, docs/docs.go with full endpoint definitions
- Fixed generated docs.go to remove unsupported LeftDelim/RightDelim fields

internal/reaction/handlers.go

@@ -99,6 +99,19 @@ func (h *Handler) requireMessageAccess(w http.ResponseWriter, r *http.Request, m
 	return userID, channelID, serverID, true
 }
 
+// @Summary Add a reaction
+// @Description Add a reaction to a message
+// @Tags reactions
+// @Accept json
+// @Produce json
+// @Security SessionAuth
+// @Param messageID path string true "Message ID"
+// @Param body body addReactionRequest true "Reaction data"
+// @Success 201 {object} reactionResponse
+// @Failure 400 {object} map[string]string
+// @Failure 401 {object} map[string]string
+// @Failure 403 {object} map[string]string
+// @Router /messages/{messageID}/reactions [post]
 func (h *Handler) Add(w http.ResponseWriter, r *http.Request) {
 	messageID := chi.URLParam(r, "messageID")
 	userID, channelID, _, ok := h.requireMessageAccess(w, r, messageID)
@@ -146,6 +159,17 @@ func (h *Handler) Add(w http.ResponseWriter, r *http.Request) {
 	json.NewEncoder(w).Encode(reaction)
 }
 
+// @Summary Remove a reaction
+// @Description Remove a reaction from a message
+// @Tags reactions
+// @Security SessionAuth
+// @Param messageID path string true "Message ID"
+// @Param emoji path string true "Emoji to remove"
+// @Success 204
+// @Failure 401 {object} map[string]string
+// @Failure 403 {object} map[string]string
+// @Failure 404 {object} map[string]string
+// @Router /messages/{messageID}/reactions/{emoji} [delete]
 func (h *Handler) Remove(w http.ResponseWriter, r *http.Request) {
 	messageID := chi.URLParam(r, "messageID")
 	emoji := chi.URLParam(r, "emoji")
@@ -185,6 +209,16 @@ func (h *Handler) Remove(w http.ResponseWriter, r *http.Request) {
 	w.WriteHeader(http.StatusNoContent)
 }
 
+// @Summary List reactions
+// @Description List reactions on a message grouped by emoji
+// @Tags reactions
+// @Produce json
+// @Security SessionAuth
+// @Param messageID path string true "Message ID"
+// @Success 200 {array} emojiGroup
+// @Failure 401 {object} map[string]string
+// @Failure 403 {object} map[string]string
+// @Router /messages/{messageID}/reactions [get]
 func (h *Handler) List(w http.ResponseWriter, r *http.Request) {
 	messageID := chi.URLParam(r, "messageID")
 	if _, _, _, ok := h.requireMessageAccess(w, r, messageID); !ok {