feat: add PostgreSQL schema isolation for playground environment

- Create schema.rs utility module with table_name() function
- Add schema prefix to all SQL queries in postgres_db.rs
- Support dev schema for playground, public for production
- Add DATABASE_SCHEMA, MONGODB_DATABASE, QDRANT_COLLECTION config
- Fix 40+ functions including videos, chunks, frames, vectors, etc.
- Update Cargo dependencies

Cargo.toml

@@ -33,10 +33,14 @@ sha2 = "0.10"
 hex = "0.4"
 uuid = { version = "1.0", features = ["v4"] }
 
-# Security
-subtle = "2.5"
-aes-gcm = "0.10"
-base64 = "0.22"
+ # Security
+ subtle = "2.5"
+ aes-gcm = "0.10"
+ base64 = "0.22"
+
+ # Text processing
+ jieba-rs = "0.8.1"
+ ferrous-opencc = { version = "0.3.1", features = ["s2t-conversion", "t2s-conversion"] }
 
 # Cache
 moka = { version = "0.12", features = ["future"] }
@@ -50,7 +54,7 @@ qdrant-client = "1.7"
 reqwest = { version = "0.12", features = ["json"] }
 
 # HTTP Server
-axum = "0.7"
+axum = { version = "0.7", features = ["multipart"] }
 tower = "0.4"
 
 # API Documentation
@@ -98,3 +102,11 @@ path = "src/playground.rs"
 [[bin]]
 name = "fix_chunks"
 path = "src/bin/fix_chunks.rs"
+
+[[bin]]
+name = "migrate_chinese_text"
+path = "src/bin/migrate_chinese_text.rs"
+
+[[bin]]
+name = "test_bm25_simple"
+path = "src/bin/test_bm25_simple.rs"