feat: Phase 3 knowledge growth - multi-file fusion + entity alignment

backend/schema.sql

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+-- InsightFlow Phase 3 - Database Schema
+-- 支持知识生长与多文件融合
+
+-- 项目表
+CREATE TABLE IF NOT EXISTS projects (
+    id TEXT PRIMARY KEY,
+    name TEXT NOT NULL,
+    description TEXT,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+-- 文件/转录表
+CREATE TABLE IF NOT EXISTS transcripts (
+    id TEXT PRIMARY KEY,
+    project_id TEXT NOT NULL,
+    filename TEXT,
+    full_text TEXT,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    FOREIGN KEY (project_id) REFERENCES projects(id)
+);
+
+-- 全局实体表（跨文件共享）
+CREATE TABLE IF NOT EXISTS entities (
+    id TEXT PRIMARY KEY,
+    project_id TEXT NOT NULL,
+    name TEXT NOT NULL,
+    canonical_name TEXT,  -- 规范名称（用于对齐）
+    type TEXT,
+    definition TEXT,
+    aliases TEXT,  -- JSON 数组：["别名1", "别名2"]
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    FOREIGN KEY (project_id) REFERENCES projects(id)
+);
+
+-- 实体提及表（文件中的具体位置）
+CREATE TABLE IF NOT EXISTS entity_mentions (
+    id TEXT PRIMARY KEY,
+    entity_id TEXT NOT NULL,
+    transcript_id TEXT NOT NULL,
+    start_pos INTEGER,
+    end_pos INTEGER,
+    text_snippet TEXT,
+    confidence REAL DEFAULT 1.0,
+    FOREIGN KEY (entity_id) REFERENCES entities(id),
+    FOREIGN KEY (transcript_id) REFERENCES transcripts(id)
+);
+
+-- 实体关系表
+CREATE TABLE IF NOT EXISTS entity_relations (
+    id TEXT PRIMARY KEY,
+    project_id TEXT NOT NULL,
+    source_entity_id TEXT NOT NULL,
+    target_entity_id TEXT NOT NULL,
+    relation_type TEXT,  -- "belongs_to", "works_with", "depends_on" 等
+    evidence TEXT,  -- 关系来源文本
+    transcript_id TEXT,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    FOREIGN KEY (project_id) REFERENCES projects(id),
+    FOREIGN KEY (source_entity_id) REFERENCES entities(id),
+    FOREIGN KEY (target_entity_id) REFERENCES entities(id)
+);
+
+-- 术语表（项目级热词，用于 ASR 优化）
+CREATE TABLE IF NOT EXISTS glossary (
+    id TEXT PRIMARY KEY,
+    project_id TEXT NOT NULL,
+    term TEXT NOT NULL,
+    pronunciation TEXT,  -- 发音提示，如 "K8s" -> "Kubernetes"
+    frequency INTEGER DEFAULT 1,
+    FOREIGN KEY (project_id) REFERENCES projects(id)
+);