feat: initial commit - oncology literature search platform

OncoLit: a multi-tenant oncology literature search, feed, and
collaboration platform. Built with FastAPI + Vue 3 + PostgreSQL.
Includes PubMed pipeline, drug approvals, AI summaries, and
systematic review tools.

frontend/src/constants/studyTypes.ts

@@ -0,0 +1,25 @@
+export const STUDY_TYPE_MAP: Record<string, { label: string; type: 'success' | 'info' | 'warning' | 'default' }> = {
+  'Randomized Controlled Trial': { label: 'RCT', type: 'success' },
+  'Clinical Trial, Phase III': { label: '3期RCT', type: 'success' },
+  'Clinical Trial, Phase II': { label: '2期研究', type: 'info' },
+  'Clinical Trial, Phase I': { label: '1期研究', type: 'default' },
+  'Meta-Analysis': { label: 'Meta分析', type: 'info' },
+  'Systematic Review': { label: '系统评价', type: 'info' },
+  'Review': { label: '综述', type: 'default' },
+  'Practice Guideline': { label: '指南', type: 'warning' },
+  'Guideline': { label: '指南', type: 'warning' },
+  'Observational Study': { label: '观察性研究', type: 'info' },
+  'Multicenter Study': { label: '多中心', type: 'info' },
+  'Comparative Study': { label: '对比研究', type: 'default' },
+  'Editorial': { label: '社论', type: 'warning' },
+  'Case Reports': { label: '病例报告', type: 'default' },
+  'Consensus Development Conference': { label: '共识', type: 'warning' },
+}
+
+export function computeStudyTypes(pubTypes: string[]): { label: string; type: 'success' | 'info' | 'warning' | 'default' }[] {
+  if (!pubTypes?.length) return []
+  return pubTypes
+    .filter((t: string) => t !== 'Journal Article')
+    .map((t: string) => STUDY_TYPE_MAP[t])
+    .filter(Boolean) as { label: string; type: 'success' | 'info' | 'warning' | 'default' }[]
+}

frontend/src/constants/tagColors.ts

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+export const tagColorMap: Record<string, string> = {
+  cancer: '#2080f0',
+  gene: '#18a058',
+  treatment: '#f0a020',
+  study_type: '#d03050',
+  endpoint: '#7c4dff',
+  scenario: '#008080',
+}
+
+export function tagColor(cat: string): string {
+  return tagColorMap[cat] || '#999'
+}