fix(schema): remove 0000-00-00 values from document_templates inserts (openemr#11251)

Towards openemr#11179

#### Short description of what this resolves:
Fixes one spot that prevents database.sql from importing into the db
while in strict mode.

Note: nothing in the code (that I or Claude found) references _either_
of these columns.

#### Changes proposed in this pull request:
Changes the zero date value in `document_templates` INSERTS to `now()`
and `null` for `send_date` and `end_date` respectively.

Updates existing data to follow this format.


#### Does your code include anything generated by an AI Engine? Yes / No
Claude made the change, I sanity-checked.

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Author: Firehed

sql/8_0_0-to-8_0_1_upgrade.sql

@@ -247,3 +247,16 @@ ALTER TABLE `medex_recalls` MODIFY `r_created` timestamp NOT NULL DEFAULT CURREN
 #IfIndex onetime_auth pid
 ALTER TABLE `onetime_auth` DROP INDEX `pid`, ADD INDEX `pid` (`pid`, `onetime_token`(32));
 #EndIf
+
+--
+-- Fix document_templates zero dates for MySQL strict mode compatibility.
+-- See: https://github.com/openemr/openemr/issues/11179
+--
+
+#IfTable document_templates
+SET @currentSQLMode = (SELECT @@sql_mode);
+SET sql_mode = '';
+UPDATE `document_templates` SET `send_date` = CURRENT_TIMESTAMP WHERE `send_date` = '0000-00-00 00:00:00';
+UPDATE `document_templates` SET `end_date` = NULL WHERE `end_date` = '0000-00-00 00:00:00';
+SET sql_mode = @currentSQLMode;
+#EndIf