Update algorithm and API documentation for smoking tracking app

- Enhanced the algorithm documentation to clarify the calculation of smoking intervals, including default values and edge cases.
- Updated API documentation to reflect changes in response formats, including the addition of `exceeded_yesterday` and adjustments to time formatting to RFC3339.
- Improved descriptions of user profile management and AI suggestions in the product documentation, ensuring consistency across all related files.
- Removed outdated sequence diagram and UI documentation files to streamline project resources.

internal/smoke/handler/smoke_next_handler.go

@@ -21,6 +21,7 @@ type nextSmokeTimeUnifiedResponse struct {
 	TodayCount  int                      `json:"today_count"`
 	Resisted    int                      `json:"resisted_count"`
 	Reduced     int                      `json:"reduced_from_yesterday"`
+	Exceeded    bool                     `json:"exceeded_yesterday"`
 	TimeNodes   []string                 `json:"time_nodes,omitempty"`
 	Advice      string                   `json:"advice,omitempty"`
 	Default     nextSmokeDefaultResponse `json:"default"`
@@ -84,7 +85,7 @@ func (h *SmokeHandler) GetNextSmokeTime(c *gin.Context) {
 		if t == nil {
 			return ""
 		}
-		return t.In(time.Local).Format(dateTimeLayout)
+		return t.In(time.Local).Format(time.RFC3339)
 	}
 
 	formatTimeString := func(value string) string {
@@ -93,10 +94,10 @@ func (h *SmokeHandler) GetNextSmokeTime(c *gin.Context) {
 			return ""
 		}
 		if t, err := time.Parse(time.RFC3339, value); err == nil {
-			return t.In(time.Local).Format(dateTimeLayout)
+			return t.In(time.Local).Format(time.RFC3339)
 		}
 		if t, err := time.ParseInLocation(dateTimeLayout, value, time.Local); err == nil {
-			return t.In(time.Local).Format(dateTimeLayout)
+			return t.In(time.Local).Format(time.RFC3339)
 		}
 		return value
 	}
@@ -137,6 +138,7 @@ func (h *SmokeHandler) GetNextSmokeTime(c *gin.Context) {
 		TodayCount:  homeSummary.TodayCount,
 		Resisted:    homeSummary.ResistedCount,
 		Reduced:     homeSummary.ReducedFromYesterday,
+		Exceeded:    homeSummary.ExceededYesterday,
 		Default:     formatDefault(defaultSuggestion),
 	}