feat(reader): increase font file size limit to 50MB for CJK fonts

Increase MAX_FONT_FILE_SIZE to 50MB to support large CJK and non-alphabetic fonts. Implement a lightweight binary font metadata parser to replace opentype.js buffer parsing, and update reader custom font composables to lazily manage blob URLs per font family.

Closes #793

server/package.json

@@ -88,7 +88,6 @@
     "nestjs-pino": "^4.6.1",
     "node-unrar-js": "^2.0.2",
     "nodemailer": "^9.0.3",
-    "opentype.js": "^2.0.0",
     "passport": "^0.7.0",
     "passport-jwt": "^4.0.1",
     "pdf-lib": "^1.17.1",
@@ -116,7 +115,6 @@
     "@types/express": "^5.0.6",
     "@types/node": "^26.1.1",
     "@types/nodemailer": "^8.0.1",
-    "@types/opentype.js": "^1.3.10",
     "@types/passport-jwt": "^4.0.1",
     "@types/pg": "^8.20.0",
     "@types/supertest": "^7.2.1",