feat: comprehensive debug logging across all controller modules

Add detailed [DEBUG] logging to every controller module when
logging.level is set to "debug". Each module with stateful debug
uses SetDebug(bool) wired from main.go. Covers stacks, backup,
cloudflare, integrations, system, monitor, settings, scheduler,
web handlers, storage, metrics, API, selfupdate, and assets.

Also includes the app export/import (.fab bundles) feature from
v0.32.0 and its debug page integration.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

controller/internal/cloudflare/waf.go

@@ -71,12 +71,23 @@ func (c *Client) GetCustomRulesetID(ctx context.Context, zoneID string) (string,
 		return "", fmt.Errorf("decode rulesets: %w", err)
 	}
 
+	if c.debug {
+		c.logger.Printf("[CF-DEBUG] GetCustomRulesetID: found %d rulesets for zone %s", len(rulesets), zoneID)
+	}
+
 	for _, rs := range rulesets {
 		if rs.Phase == wafPhase {
+			if c.debug {
+				c.logger.Printf("[CF-DEBUG] GetCustomRulesetID: matched ruleset %s (phase=%s)", rs.ID, wafPhase)
+			}
 			return rs.ID, nil
 		}
 	}
 
+	if c.debug {
+		c.logger.Printf("[CF-DEBUG] GetCustomRulesetID: no ruleset with phase %s found", wafPhase)
+	}
+
 	return "", nil
 }
 
@@ -119,6 +130,10 @@ func (c *Client) GetRules(ctx context.Context, zoneID, rulesetID string) ([]rule
 		return nil, fmt.Errorf("decode rules: %w", err)
 	}
 
+	if c.debug {
+		c.logger.Printf("[CF-DEBUG] GetRules: %d total rules in ruleset %s", len(rs.Rules), rulesetID)
+	}
+
 	return rs.Rules, nil
 }
 
@@ -141,6 +156,10 @@ func (c *Client) GetFelhomRules(ctx context.Context, zoneID, rulesetID string) (
 		}
 	}
 
+	if c.debug {
+		c.logger.Printf("[CF-DEBUG] GetFelhomRules: %d felhom rules out of %d total", len(result), len(rules))
+	}
+
 	return result, nil
 }
 
@@ -163,6 +182,13 @@ func (c *Client) CreateRule(ctx context.Context, zoneID, rulesetID string, r rul
 	for _, created := range rs.Rules {
 		if created.Description == r.Description {
 			c.logger.Printf("[CF] Created rule %q → %s", r.Description, created.ID)
+			if c.debug {
+				expr := r.Expression
+				if len(expr) > 120 {
+					expr = expr[:120] + "..."
+				}
+				c.logger.Printf("[CF-DEBUG] CreateRule: expression: %s", expr)
+			}
 			return created.ID, nil
 		}
 	}
@@ -178,6 +204,13 @@ func (c *Client) UpdateRule(ctx context.Context, zoneID, rulesetID, ruleID strin
 		return fmt.Errorf("update rule %s: %w", ruleID, err)
 	}
 	c.logger.Printf("[CF] Updated rule %q (%s)", r.Description, ruleID)
+	if c.debug {
+		expr := r.Expression
+		if len(expr) > 120 {
+			expr = expr[:120] + "..."
+		}
+		c.logger.Printf("[CF-DEBUG] UpdateRule: expression: %s", expr)
+	}
 	return nil
 }