Fix all lint issues: Dockerfiles (DL3015/DL3013/DL4006) + Ruff (173→0 errors)

Dockerfile fixes:
- edu_master/phpsessid-bot: add --no-install-recommends, pin pip versions
- edu_master/webinar-checker: pin pip versions with --no-cache-dir
- userbot: add SHELL with pipefail for pipe operations

Ruff fixes (173 → 0):
- W293/W291/W292: whitespace clean via ruff format
- N806: camelCase → snake_case (anilist, safone, hearts, flux, etc.)
- ARG001/ARG002: prefix unused params with _
- SIM115: use context managers for file I/O
- SIM117: combine nested with statements
- S608: noqa on SQL f-strings (module name is validated)
- E402/N812/N817: import fixes
- B023: pass loop variable as argument
- I001: auto-sorted imports
- syntax: fixed = vs == in dtek_notif/main.py

userbot/modules/misc/safone.py

@@ -166,17 +166,17 @@ async def app(client: Client, message: Message):
         result = response.json()
 
         try:
-            coverImage_url = result['results'][0]['icon']
-            coverImage = requests.get(url=coverImage_url, timeout=10).content
-            async with aiofiles.open('coverImage.jpg', mode='wb') as f:
-                await f.write(coverImage)
+            cover_image_url = result['results'][0]['icon']
+            cover_image = requests.get(url=cover_image_url, timeout=10).content
+            async with aiofiles.open('cover_image.jpg', mode='wb') as f:
+                await f.write(cover_image)
 
         except Exception:
-            coverImage = None
+            cover_image = None
 
         description = result['results'][0]['description']
         developer = result['results'][0]['developer']
-        IsFree = result['results'][0]['free']
+        is_free = result['results'][0]['free']
         genre = result['results'][0]['genre']
         package_name = result['results'][0]['id']
         title = result['results'][0]['title']
@@ -189,8 +189,8 @@ async def app(client: Client, message: Message):
             chat_id,
             [
                 InputMediaPhoto(
-                    'coverImage.jpg',
-                    caption=f'<b>Title:</b> <code>{title}</code>\n<b>Rating:</b> <code>{rating}</code>\n<b>IsFree:</b> <code>{IsFree}</code>\n<b>Price:</b> <code>{price}</code>\n<b>Package Name:</b> <code>{package_name}</code>\n<b>Genres:</b> <code>{genre}</code>\n<b>Developer:</b> <code>{developer}\n<b>Description:</b> {description}\n<b>Link:</b> {link}',
+                    'cover_image.jpg',
+                    caption=f'<b>Title:</b> <code>{title}</code>\n<b>Rating:</b> <code>{rating}</code>\n<b>is_free:</b> <code>{is_free}</code>\n<b>Price:</b> <code>{price}</code>\n<b>Package Name:</b> <code>{package_name}</code>\n<b>Genres:</b> <code>{genre}</code>\n<b>Developer:</b> <code>{developer}\n<b>Description:</b> {description}\n<b>Link:</b> {link}',
                 )
             ],
         )
@@ -202,16 +202,16 @@ async def app(client: Client, message: Message):
             chat_id,
             [
                 InputMediaPhoto(
-                    'coverImage.jpg',
-                    caption=f'<b>Title:</b> <code>{title}</code>\n<b>Rating:</b> <code>{rating}</code>\n<b>IsFree:</b> <code>{IsFree}</code>\n<b>Price:</b> <code>{price}</code>\n<b>Package Name:</b> <code>{package_name}</code>\n<b>Genres:</b> <code>{genre}</code>\n<b>Developer:</b> <code>{developer}\n<b>Description:</b> {description}\n<b>Link:</b> {link}',
+                    'cover_image.jpg',
+                    caption=f'<b>Title:</b> <code>{title}</code>\n<b>Rating:</b> <code>{rating}</code>\n<b>is_free:</b> <code>{is_free}</code>\n<b>Price:</b> <code>{price}</code>\n<b>Package Name:</b> <code>{package_name}</code>\n<b>Genres:</b> <code>{genre}</code>\n<b>Developer:</b> <code>{developer}\n<b>Description:</b> {description}\n<b>Link:</b> {link}',
                 )
             ],
         )
     except Exception as e:
         await message.edit_text(format_exc(e))
     finally:
-        if os.path.exists('coverImage.jpg'):
-            os.remove('coverImage.jpg')
+        if os.path.exists('cover_image.jpg'):
+            os.remove('cover_image.jpg')
 
 
 @Client.on_message(filters.command('tsearch', prefix) & filters.me)
@@ -232,7 +232,7 @@ async def tsearch(client: Client, message: Message):
 
         result = response.json()
 
-        coverImage_url = result['results'][0]['thumbnail']
+        cover_image_url = result['results'][0]['thumbnail']
         description = result['results'][0]['description']
         genre = result['results'][0]['genre']
         category = result['results'][0]['category']
@@ -264,17 +264,17 @@ async def tsearch(client: Client, message: Message):
             content=all_results_content,
         )
 
-        if coverImage_url is not None:
-            coverImage = requests.get(url=coverImage_url, timeout=10).content
-            async with aiofiles.open('coverImage.jpg', mode='wb') as f:
-                await f.write(coverImage)
+        if cover_image_url is not None:
+            cover_image = requests.get(url=cover_image_url, timeout=10).content
+            async with aiofiles.open('cover_image.jpg', mode='wb') as f:
+                await f.write(cover_image)
 
             await message.delete()
             await client.send_media_group(
                 chat_id,
                 [
                     InputMediaPhoto(
-                        'coverImage.jpg',
+                        'cover_image.jpg',
                         caption=f"<b>Title:</b> <code>{title}</code>\n<b>Category:</b> <code>{category}</code>\n<b>Language:</b> <code>{language}</code>\n<b>Size:</b> <code>{size}</code>\n<b>Genres:</b> <code>{genre}</code>\n<b>Description:</b> {description}\n<b>Magnet Link:</b> <a href='{link_result}'>Click Here</a>\n<b>More Results:</b> <a href='{link_results}'>Click Here</a>",
                     )
                 ],
@@ -292,7 +292,7 @@ async def tsearch(client: Client, message: Message):
             chat_id,
             [
                 InputMediaPhoto(
-                    'coverImage.jpg',
+                    'cover_image.jpg',
                     caption=f"<b>Title:</b> <code>{title}</code>\n<b>Category:</b> <code>{category}</code>\n<b>Language:</b> <code>{language}</code>\n<b>Size:</b> <code>{size}</code>\n<b>Genres:</b> <code>{genre}</code>\n<b>Description:</b> {description}\n<b>Magnet Link:</b> <a href='{link_result}'>Click Here</a>",
                 )
             ],
@@ -308,8 +308,8 @@ async def tsearch(client: Client, message: Message):
     except Exception as e:
         await message.edit_text(format_exc(e))
     finally:
-        if os.path.exists('coverImage.jpg'):
-            os.remove('coverImage.jpg')
+        if os.path.exists('cover_image.jpg'):
+            os.remove('cover_image.jpg')
 
 
 @Client.on_message(filters.command('stts', prefix) & filters.me)