feat: 初始化 AstroResearch 核心系统代码及重构技术文档

migrations/20260608000000_init.sql

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+-- migrations/20260608000000_init.sql
+
+CREATE TABLE IF NOT EXISTS papers (
+    bibcode TEXT PRIMARY KEY,
+    title TEXT NOT NULL,
+    authors TEXT,          -- JSON array of author names
+    year TEXT,
+    pub TEXT,              -- journal / publisher
+    keywords TEXT,         -- JSON array of keywords
+    abstract TEXT,
+    doi TEXT,
+    arxiv_id TEXT,
+    citation_count INTEGER DEFAULT 0,
+    reference_count INTEGER DEFAULT 0,
+    pdf_path TEXT,
+    html_path TEXT,
+    markdown_path TEXT,
+    translation_path TEXT,
+    created_at DATETIME DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE TABLE IF NOT EXISTS citations_references (
+    source_bibcode TEXT NOT NULL,
+    target_bibcode TEXT NOT NULL,
+    PRIMARY KEY (source_bibcode, target_bibcode)
+);
+
+-- Indexes for performance
+CREATE INDEX IF NOT EXISTS idx_papers_doi ON papers(doi);
+CREATE INDEX IF NOT EXISTS idx_papers_arxiv_id ON papers(arxiv_id);
+CREATE INDEX IF NOT EXISTS idx_citations_ref_source ON citations_references(source_bibcode);
+CREATE INDEX IF NOT EXISTS idx_citations_ref_target ON citations_references(target_bibcode);

migrations/20260608000001_notes.sql

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+-- migrations/20260608000001_notes.sql
+-- 笔记/高亮表：每条记录对应一篇文献中某个段落的标注笔记
+
+CREATE TABLE IF NOT EXISTS notes (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    bibcode TEXT NOT NULL,
+    paragraph_index INTEGER NOT NULL, -- 在文章 Markdown 段落中的序号（从 0 开始）
+    note_text TEXT NOT NULL DEFAULT '',
+    highlight_color TEXT NOT NULL DEFAULT 'yellow', -- 'yellow' | 'green' | 'blue' | 'pink'
+    selected_text TEXT NOT NULL DEFAULT '',         -- 被高亮选中的原始文本片段
+    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+    FOREIGN KEY (bibcode) REFERENCES papers(bibcode) ON DELETE CASCADE
+);
+
+CREATE INDEX IF NOT EXISTS idx_notes_bibcode ON notes(bibcode);