Add API key management UI and wire S2 key to MCP

- Settings modal on project list page for OpenAI, Anthropic, OpenRouter, Gemini, Semantic Scholar keys
- Keys stored in userData/api-keys.json, masked by default with show/hide toggle
- S2 API key passed to MCP server via .lattex-mcp.json to avoid rate limits

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

1 files changed, 11 insertions, 3 deletions

diff --git a/src/mcp/lattex.mjs b/src/mcp/lattex.mjs
index 65f6d87..64520f7 100644
--- a/src/mcp/lattex.mjs
+++ b/src/mcp/lattex.mjs
@@ -528,6 +528,13 @@ const TOOLS = [
 
 // ── Semantic Scholar helpers ─────────────────────────────────
 
+function getSemanticScholarApiKey() {
+  try {
+    const state = readState()
+    return state.semanticScholarApiKey || null
+  } catch { return null }
+}
+
 function semanticScholarSearch(query, limit) {
   return new Promise((resolve) => {
     const params = new URLSearchParams({
@@ -535,13 +542,14 @@ function semanticScholarSearch(query, limit) {
       limit: String(limit),
       fields: 'title,authors,year,externalIds,venue,publicationDate,abstract,citationCount'
     })
+    const headers = { 'User-Agent': 'LatteX-MCP/1.0' }
+    const apiKey = getSemanticScholarApiKey()
+    if (apiKey) headers['x-api-key'] = apiKey
     const options = {
       hostname: 'api.semanticscholar.org',
       path: `/graph/v1/paper/search?${params}`,
       method: 'GET',
-      headers: {
-        'User-Agent': 'LatteX-MCP/1.0'
-      }
+      headers
     }
 
     const req = https.request(options, (res) => {