fix(backend): Add retry and error handling to block initialization (#11946)

## Summary
Adds retry logic and graceful error handling to `initialize_blocks()` to
prevent transient DB errors from crashing server startup.

## Problem
When a transient database error occurs during block initialization
(e.g., Prisma P1017 "Server has closed the connection"), the entire
server fails to start. This is overly aggressive since:
1. Blocks are already registered in memory
2. The DB sync is primarily for tracking/schema storage
3. One flaky connection shouldn't prevent the server from starting

**Triggered by:** [Sentry
AUTOGPT-SERVER-7PW](https://significant-gravitas.sentry.io/issues/7238733543/)

## Solution
- Add retry decorator (3 attempts with exponential backoff) for DB
operations
- On failure after retries, log a warning and continue to the next block
- Blocks remain available in memory even if DB sync fails
- Log summary of any failed blocks at the end

## Changes
- `autogpt_platform/backend/backend/data/block.py`: Wrap block DB sync
in retry logic with graceful fallback

## Testing
- Existing block initialization behavior unchanged on success
- On transient DB errors: retries up to 3 times, then continues with
warning

autogpt_platform/backend/backend/data/block.py

@@ -873,14 +873,13 @@ def is_block_auth_configured(
 
 
 async def initialize_blocks() -> None:
-    # First, sync all provider costs to blocks
-    # Imported here to avoid circular import
     from backend.sdk.cost_integration import sync_all_provider_costs
+    from backend.util.retry import func_retry
 
     sync_all_provider_costs()
 
-    for cls in get_blocks().values():
-        block = cls()
+    @func_retry
+    async def sync_block_to_db(block: Block) -> None:
         existing_block = await AgentBlock.prisma().find_first(
             where={"OR": [{"id": block.id}, {"name": block.name}]}
         )
@@ -893,7 +892,7 @@ async def initialize_blocks() -> None:
                     outputSchema=json.dumps(block.output_schema.jsonschema()),
                 )
             )
-            continue
+            return
 
         input_schema = json.dumps(block.input_schema.jsonschema())
         output_schema = json.dumps(block.output_schema.jsonschema())
@@ -913,6 +912,25 @@ async def initialize_blocks() -> None:
                 },
             )
 
+    failed_blocks: list[str] = []
+    for cls in get_blocks().values():
+        block = cls()
+        try:
+            await sync_block_to_db(block)
+        except Exception as e:
+            logger.warning(
+                f"Failed to sync block {block.name} to database: {e}. "
+                "Block is still available in memory.",
+                exc_info=True,
+            )
+            failed_blocks.append(block.name)
+
+    if failed_blocks:
+        logger.error(
+            f"Failed to sync {len(failed_blocks)} block(s) to database: "
+            f"{', '.join(failed_blocks)}. These blocks are still available in memory."
+        )
+
 
 # Note on the return type annotation: https://github.com/microsoft/pyright/issues/10281
 def get_block(block_id: str) -> AnyBlockSchema | None: