v0.2.0: CRM/ERP 系统升级 - 清理 .gitignore 并移除误提交的 venv/env/db 文件

- 更新 .gitignore：全面覆盖环境变量、数据库、日志、缓存、上传文件
- 移除误跟踪的 server/venv/、crm_data.db、.env 文件
- 新增 server/.env.example 模板
- 新增合同管理、利润核算、AI教练等功能模块
- 新增 Playwright e2e 测试套件
- 前后端多项功能升级和 bug 修复

server/alembic/versions/20260327_phase_d_pgvector.py

@@ -0,0 +1,43 @@
+"""Phase D addon: pgvector kb_obsidian_vectors table
+
+Revision ID: b8c9d0e1f2a3
+Revises: a7b8c9d0e1f2
+Create Date: 2026-03-27
+
+Prerequisites: sudo apt-get install postgresql-16-pgvector
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects.postgresql import UUID, JSONB
+
+revision = "b8c9d0e1f2a3"
+down_revision = "a7b8c9d0e1f2"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.execute("CREATE EXTENSION IF NOT EXISTS vector")
+    op.create_table(
+        "kb_obsidian_vectors",
+        sa.Column("id", UUID(as_uuid=True), primary_key=True),
+        sa.Column("company_id", UUID(as_uuid=True), sa.ForeignKey("sys_companies.id"), nullable=False, index=True),
+        sa.Column("source_path", sa.String(500), nullable=False, comment="源文件路径"),
+        sa.Column("chunk_index", sa.SmallInteger, server_default="0"),
+        sa.Column("content", sa.Text, nullable=False),
+        sa.Column("metadata", JSONB, nullable=True),
+        sa.Column("created_at", sa.DateTime, server_default=sa.func.now()),
+        sa.Column("is_deleted", sa.Boolean, server_default="false"),
+    )
+    op.execute("ALTER TABLE kb_obsidian_vectors ADD COLUMN embedding vector(1536)")
+    op.execute("""
+        CREATE INDEX ix_kb_obsidian_vectors_embedding 
+        ON kb_obsidian_vectors 
+        USING hnsw (embedding vector_cosine_ops)
+    """)
+
+
+def downgrade() -> None:
+    op.execute("DROP INDEX IF EXISTS ix_kb_obsidian_vectors_embedding")
+    op.drop_table("kb_obsidian_vectors")
+    op.execute("DROP EXTENSION IF EXISTS vector")