Remove dead normalizeIssue function and make legal pages linkable

- Remove unused normalizeIssue and JIRA_STORY_POINTS_FIELD env var
- Add URL routing for /terms, /privacy, /support pages

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

backend/src/services/jiraService.js

@@ -193,20 +193,8 @@ async function jiraFetch(jiraAccountId, path, options = {}) {
   return response.json();
 }
 
-function normalizeIssue(issue) {
-  return {
-    id: issue.id,
-    key: issue.key,
-    title: issue.fields?.summary || issue.key,
-    description: issue.fields?.description || null,
-    estimate: issue.fields?.[process.env.JIRA_STORY_POINTS_FIELD || 'customfield_10016'] || 0,
-    status: issue.fields?.status?.name || 'Unknown',
-    reporter: issue.fields?.reporter?.displayName || null
-  };
-}
-
 export async function getSprintIssues(jiraAccountId, sprintId, boardId) {
-  let spField = process.env.JIRA_STORY_POINTS_FIELD || 'customfield_10016';
+  let spField = 'customfield_10016';
   if (boardId) {
     try {
       const config = await jiraFetch(jiraAccountId, `/rest/agile/1.0/board/${boardId}/configuration`);