chore: 添加虚拟环境到仓库

- 添加 backend_service/venv 虚拟环境
- 包含所有Python依赖包
- 注意：虚拟环境约393MB，包含12655个文件

backend_service/venv/lib/python3.13/site-packages/chromadb/migrations/sysdb/00001-collections.sqlite.sql

@@ -0,0 +1,15 @@
+CREATE TABLE collections (
+    id TEXT PRIMARY KEY,
+    name TEXT NOT NULL,
+    topic TEXT NOT NULL,
+    UNIQUE (name)
+);
+
+CREATE TABLE collection_metadata (
+    collection_id TEXT REFERENCES collections(id) ON DELETE CASCADE,
+    key TEXT NOT NULL,
+    str_value TEXT,
+    int_value INTEGER,
+    float_value REAL,
+    PRIMARY KEY (collection_id, key)
+);

backend_service/venv/lib/python3.13/site-packages/chromadb/migrations/sysdb/00002-segments.sqlite.sql

@@ -0,0 +1,16 @@
+CREATE TABLE segments (
+    id TEXT PRIMARY KEY,
+    type TEXT NOT NULL,
+    scope TEXT NOT NULL,
+    topic TEXT,
+    collection TEXT REFERENCES collection(id)
+);
+
+CREATE TABLE segment_metadata (
+    segment_id TEXT  REFERENCES segments(id) ON DELETE CASCADE,
+    key TEXT NOT NULL,
+    str_value TEXT,
+    int_value INTEGER,
+    float_value REAL,
+    PRIMARY KEY (segment_id, key)
+);

backend_service/venv/lib/python3.13/site-packages/chromadb/migrations/sysdb/00003-collection-dimension.sqlite.sql

@@ -0,0 +1 @@
+ALTER TABLE collections ADD COLUMN dimension INTEGER;

backend_service/venv/lib/python3.13/site-packages/chromadb/migrations/sysdb/00004-tenants-databases.sqlite.sql

@@ -0,0 +1,29 @@
+CREATE TABLE IF NOT EXISTS tenants (
+    id TEXT PRIMARY KEY,
+    UNIQUE (id)
+);
+
+CREATE TABLE IF NOT EXISTS databases (
+    id TEXT PRIMARY KEY, -- unique globally
+    name TEXT NOT NULL, -- unique per tenant
+    tenant_id TEXT NOT NULL REFERENCES tenants(id) ON DELETE CASCADE,
+    UNIQUE (tenant_id, name) -- Ensure that a tenant has only one database with a given name
+);
+
+CREATE TABLE IF NOT EXISTS collections_tmp (
+    id TEXT PRIMARY KEY, -- unique globally
+    name TEXT NOT NULL, -- unique per database
+    topic TEXT NOT NULL,
+    dimension INTEGER,
+    database_id TEXT NOT NULL REFERENCES databases(id) ON DELETE CASCADE,
+    UNIQUE (name, database_id)
+);
+
+-- Create default tenant and database
+INSERT OR REPLACE INTO tenants (id) VALUES ('default_tenant'); -- The default tenant id is 'default_tenant' others are UUIDs
+INSERT OR REPLACE INTO databases (id, name, tenant_id) VALUES ('00000000-0000-0000-0000-000000000000', 'default_database', 'default_tenant');
+
+INSERT OR REPLACE INTO collections_tmp (id, name, topic, dimension, database_id)
+    SELECT id, name, topic, dimension, '00000000-0000-0000-0000-000000000000' FROM collections;
+DROP TABLE collections;
+ALTER TABLE collections_tmp RENAME TO collections;

backend_service/venv/lib/python3.13/site-packages/chromadb/migrations/sysdb/00005-remove-topic.sqlite.sql

@@ -0,0 +1,4 @@
+-- Remove the topic column from the Collections and Segments tables
+
+ALTER TABLE collections DROP COLUMN topic;
+ALTER TABLE segments DROP COLUMN topic;

backend_service/venv/lib/python3.13/site-packages/chromadb/migrations/sysdb/00006-collection-segment-metadata.sqlite.sql

@@ -0,0 +1,6 @@
+-- SQLite does not support adding check with alter table, as a result, adding a check
+-- involve creating a new table and copying the data over. It is over kill with adding
+-- a boolean type column. The application write to the table needs to ensure the data
+-- integrity.
+ALTER TABLE collection_metadata ADD COLUMN bool_value INTEGER;
+ALTER TABLE segment_metadata ADD COLUMN bool_value INTEGER;

backend_service/venv/lib/python3.13/site-packages/chromadb/migrations/sysdb/00007-collection-config.sqlite.sql

@@ -0,0 +1,2 @@
+-- Stores collection configuration dictionaries.
+ALTER TABLE collections ADD COLUMN config_json_str TEXT;

backend_service/venv/lib/python3.13/site-packages/chromadb/migrations/sysdb/00008-maintenance-log.sqlite.sql

@@ -0,0 +1,7 @@
+-- Records when database maintenance operations are performed.
+-- At time of creation, this table is only used to record vacuum operations.
+CREATE TABLE maintenance_log (
+  id INT PRIMARY KEY,
+  timestamp INT NOT NULL,
+  operation TEXT NOT NULL
+);

backend_service/venv/lib/python3.13/site-packages/chromadb/migrations/sysdb/00009-segment-collection-not-null.sqlite.sql

@@ -0,0 +1,11 @@
+-- This makes segments.collection non-nullable.
+CREATE TABLE segments_temp (
+    id TEXT PRIMARY KEY,
+    type TEXT NOT NULL,
+    scope TEXT NOT NULL,
+    collection TEXT REFERENCES collection(id) NOT NULL
+);
+
+INSERT INTO segments_temp SELECT * FROM segments;
+DROP TABLE segments;
+ALTER TABLE segments_temp RENAME TO segments;