Fix poll vote submission failure and add pridecorner.ca nginx routing

Users could not submit scheduling poll votes when an invalid or partial
email was entered — Zod rejected empty strings and non-email text with a
generic validation error. Added client-side email validation in both
SchedulingPollPage and SchedulingPollWidget, plus z.preprocess() on the
backend to coerce empty strings to undefined. Also added pridecorner.ca
to all nginx server blocks and added generate_nginx_configs() to
config.sh so template-based configs are generated during setup.

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

api/src/modules/meeting-planner/meeting-planner.schemas.ts

@@ -37,7 +37,10 @@ export const addOptionsSchema = z.object({
 
 export const submitVotesSchema = z.object({
   voterName: z.string().min(1, 'Name is required').max(100),
-  voterEmail: z.string().email().max(200).optional(),
+  voterEmail: z.preprocess(
+    (val) => (typeof val === 'string' && val.trim() === '' ? undefined : val),
+    z.string().email('Please enter a valid email address').max(200).optional(),
+  ),
   voterToken: z.string().optional(),
   votes: z.array(z.object({
     optionId: z.string().min(1),