feat: Phase 1 handover - schema migration, correction mechanism, API fixes

Schema changes: dev.chunks->dev.chunk, remove old_chunk_id/chunk_index
Correction: asr-1.json format, generate/apply scripts
API: 37/37 endpoints fixed and tested
Docs: HANDOVER_V2.0.md for M4

docs/M4_VS_M5_COMPARISON.md

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+# M4 vs M5 Max Comparison
+
+## Hardware
+
+| Spec | M4 (Mac Mini) | M5 (MacBook Pro) |
+|------|--------------|-------------------|
+| **Model** | Mac Mini (M4) | MacBook Pro (M5 Max) |
+| **Hostname** | `accusys-Mac-mini-M4-2.local` | `Accusyss-MacBook-Pro.local` |
+| **macOS** | 26.4.1 (Sequoia) | 26.4.1 (Sequoia) |
+| **RAM** | 16 GB | **48 GB** |
+| **CPU Cores** | 10 | **18** |
+| **Disk** | 2TB (est.) | **1.8TB (12GB used, 97% free)** |
+| **Network** | 192.168.110.210, 192.168.110.200 | 192.168.110.201, 192.168.31.182 |
+
+## Installed Services
+
+| Service | M4 | M5 |
+|---------|-----|------|
+| **PostgreSQL** | 18.1 (Homebrew) | **18.3 (Source build)** |
+| **pgvector** | Homebrew | **0.8.2 (Source build)** |
+| **Redis** | 8.4.0 (Homebrew) | **7.4.3 (Source build)** |
+| **Qdrant** | Homebrew/pre-built | **1.17.1 (Source build, `cargo`)** |
+| **MongoDB** | Homebrew | 8.2.7 (Homebrew) |
+| **MariaDB** | ✗ via brew | **12.2.2 (Homebrew, for WordPress)** |
+| **PHP** | ✗ via brew | **8.5.5 (Homebrew, WordPress ext. ✅)** |
+| **SFTPGo** | Pre-built binary | **2.7.1 (Source build, patched dep)** |
+| **FFmpeg** | 8.1 (Homebrew) | **8.1.1 (Homebrew)** |
+| **OpenCode** | 1.14.39 | **1.14.39** |
+| **Gemma4 LLM** | ✗ (not enough RAM) | **31B Q5_K_M @ 8081** |
+
+## Build Approach
+
+| Aspect | M4 | M5 |
+|--------|-----|-----|
+| **PostgreSQL** | `brew install postgresql@18` | `./configure && make && make install` |
+| **Redis** | `brew install redis` | `make && cp src/redis-server ~/redis/bin/` |
+| **Qdrant** | `brew install qdrant` | `cargo build --release --bin qdrant` (from GitHub) |
+| **SFTPGo** | `brew install sftpgo` | `git clone && go build` (patched `go-m1cpu`) |
+| **Philosophy** | Mixed (Homebrew + binary) | **Source-first** (GitHub source, checksums recorded) |
+
+## Data Migration (M4 → M5)
+
+| Data | Size | Status |
+|------|------|--------|
+| **Database (dev schema)** | 837MB dump | ✅ Restored (16 tables) |
+| **Video file** | 2.2GB | ✅ Transferred |
+| **output_dev JSON** | 2.9GB (462 files) | ✅ Transferred |
+| **output JSON** | 65MB (2523 files) | ✅ Transferred |
+| **Configs** | small | ✅ Transferred |
+
+## Database Row Counts (M5)
+
+| Table | Rows |
+|-------|------|
+| `pre_chunks` | 494,339 |
+| `face_detections` | 6,211 |
+| `tkg_nodes` | 2,414 |
+| `identity_bindings` | 2,347 |
+| `tkg_edges` | 1,320 |
+
+## Key Differences
+
+### 1. RAM (16GB vs 48GB)
+- **M4 (16GB)**: Cannot run Gemma4 31B LLM locally. Memory pressure during concurrent pipeline processing.
+- **M5 (48GB)**: Can run Gemma4 31B (Q5_K_M, ~20GB) + databases + playground simultaneously. 
+
+### 2. Build Philosophy
+- **M4**: Quick setup via Homebrew bottles (pre-compiled).
+- **M5**: **Source-first** — every service built from GitHub/official source. `SHA256` checksums recorded. Dependencies patched as needed (SFTPGo `go-m1cpu`).
+
+### 3. Unique M5 Services
+- **MariaDB + PHP**: Installed for WordPress/marcom portal development.
+- **Gemma4 LLM**: Running on port 8081, accessible for RAG/identity clustering.
+- **OpenCode**: Configured with Gemma4 provider for AI-assisted development.
+
+### 4. Data Freshness
+- M5 is a **snapshot** of M4's state at 2026-05-06 (commit `bac6c2d`). Changes made on M4 after sync date must be re-synced.