docs: reformat README tables for better raw readability

Update Markdown tables including InfraHub comparison, Prefect benefits, and project progress phases to use consistent column padding. This improves the visual alignment and readability when viewing the raw source file.

.infrahub.yml

@@ -0,0 +1,3 @@
+---
+schemas:
+  - schemas

README.md

@@ -25,7 +25,7 @@ Think `terraform plan` and `terraform apply`, but for your network fabric — po
 We chose [InfraHub](https://github.com/opsmill/infrahub) over NetBox as Source of Truth for several reasons:
 
 | Feature             | NetBox                | InfraHub                             |
-|---------|--------|----------|
+| ------------------- | --------------------- | ------------------------------------ |
 | **Schema**          | Fixed DCIM/IPAM model | Fully customizable YAML schema       |
 | **Git Integration** | External sync needed  | Native - branches = data branches    |
 | **Versioning**      | Changelog only        | True Git-like versioning with merges |
@@ -99,7 +99,7 @@ git push
 ## 🎛 Why Prefect?
 
 | Feature                          | Benefit                                                                |
-|---------|---------|
+| -------------------------------- | ---------------------------------------------------------------------- |
 | **Python-native workflows**      | Use `@flow` and `@task` decorators — no YAML, just Python              |
 | **Free secrets management**      | Native `Secret` blocks for credentials (free in OSS)                   |
 | **Built-in UI**                  | Dashboard, logs, metrics, execution history via `prefect server start` |
@@ -125,7 +125,7 @@ Reference: [arista-evpn-vxlan-clab](https://gitea.arnodo.fr/Damien/arista-evpn-v
 Progress is tracked via issues. See [all issues](https://gitea.arnodo.fr/Damien/fabric-orchestrator/issues) or filter by phase:
 
 | Phase       | Description                                                          | Status        |
-|-------|-------------|--------|
+| ----------- | -------------------------------------------------------------------- | ------------- |
 | **Phase 1** | YANG Path Discovery - Map EOS 4.35.0F YANG models, validate gNMI     | ✅ Complete    |
 | **Phase 2** | InfraHub Setup & Core Reconciler - Schema, diff engine, YANG mappers | 🔄 In Progress |
 | **Phase 3** | Full Fabric Coverage - BGP, MLAG, VRFs mappers                       | 📋 Planned     |
@@ -198,7 +198,7 @@ fabric-orchestrator/
 ## 🛠️ Technology Stack
 
 | Component       | Technology                 | Purpose                              |
-|-----------|------------|---------|
+| --------------- | -------------------------- | ------------------------------------ |
 | Source of Truth | **InfraHub**               | Intent definition via custom schema  |
 | Data Storage    | **This Git repo**          | Schema + data versioned together     |
 | Orchestrator    | **Prefect**                | Python-native workflow orchestration |